Revert shared dart2js messages.

pkg/compiler/lib/src/diagnostics/messages.dart

 // Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
+
+/**
+ * The messages in this file should meet the following guide lines:
+ *
+ * 1. The message should be a complete sentence starting with an uppercase
+ * letter, and ending with a period.
+ *
+ * 2. Reserved words and embedded identifiers should be in single quotes, so
+ * prefer double quotes for the complete message. For example, "The
+ * class '#{className}' can't use 'super'." Notice that the word 'class' in the
+ * preceding message is not quoted as it refers to the concept 'class', not the
+ * reserved word. On the other hand, 'super' refers to the reserved word. Do
+ * not quote 'null' and numeric literals.
+ *
+ * 3. Do not try to compose messages, as it can make translating them hard.
+ *
+ * 4. Try to keep the error messages short, but informative.
+ *
+ * 5. Use simple words and terminology, assume the reader of the message
+ * doesn't have an advanced degree in math, and that English is not the
+ * reader's native language. Do not assume any formal computer science
+ * training. For example, do not use Latin abbreviations (prefer "that is" over
+ * "i.e.", and "for example" over "e.g."). Also avoid phrases such as "if and
+ * only if" and "iff", that level of precision is unnecessary.
+ *
+ * 6. Prefer contractions when they are in common use, for example, prefer
+ * "can't" over "cannot". Using "cannot", "must not", "shall not", etc. is
+ * off-putting to people new to programming.
+ *
+ * 7. Use common terminology, preferably from the Dart Language
+ * Specification. This increases the user's chance of finding a good
+ * explanation on the web.
+ *
+ * 8. Do not try to be cute or funny. It is extremely frustrating to work on a
+ * product that crashes with a "tongue-in-cheek" message, especially if you did
+ * not want to use this product to begin with.
+ *
+ * 9. Do not lie, that is, do not write error messages containing phrases like
+ * "can't happen".  If the user ever saw this message, it would be a
+ * lie. Prefer messages like: "Internal error: This function should not be
+ * called when 'x' is null.".
+ *
+ * 10. Prefer to not use imperative tone. That is, the message should not sound
+ * accusing or like it is ordering the user around. The computer should
+ * describe the problem, not criticize for violating the specification.
+ *
+ * Other things to keep in mind:
+ *
+ * An INFO message should always be preceded by a non-INFO message, and the
+ * INFO messages are additional details about the preceding non-INFO
+ * message. For example, consider duplicated elements. First report a WARNING
+ * or ERROR about the duplicated element, and then report an INFO about the
+ * location of the existing element.
+ *
+ * Generally, we want to provide messages that consists of three sentences:
+ * 1. what is wrong, 2. why is it wrong, 3. how do I fix it. However, we
+ * combine the first two in [template] and the last in [howToFix].
+ */
+
 library dart2js.messages;
 
-import 'package:dart_messages/shared_messages.dart' as shared_messages;
+import '../tokens/token.dart' show
+    ErrorToken,
+    Token;
 
-import '../tokens/token.dart' show ErrorToken, Token;
+import 'invariant.dart' show
+    invariant;
+import 'spannable.dart' show
+    CURRENT_ELEMENT_SPANNABLE;
 
-import 'invariant.dart' show invariant;
-import 'spannable.dart' show CURRENT_ELEMENT_SPANNABLE;
-
-import 'dart2js_messages.dart' as dart2js_messages;
+const DONT_KNOW_HOW_TO_FIX = "Computer says no!";
 
 /// Keys for the [MessageTemplate]s.
 enum MessageKind {
   ABSTRACT_CLASS_INSTANTIATION,
   ABSTRACT_GETTER,
   ABSTRACT_METHOD,
   ABSTRACT_SETTER,
   ACCESSED_IN_CLOSURE,
   ACCESSED_IN_CLOSURE_HERE,
   ADDITIONAL_ARGUMENT,
@@ skipping 374 matching lines @@
   UNUSED_TYPEDEF,
   VAR_FUNCTION_TYPE_PARAMETER,
   VOID_EXPRESSION,
   VOID_NOT_ALLOWED,
   VOID_VARIABLE,
   WRONG_ARGUMENT_FOR_JS_INTERCEPTOR_CONSTANT,
   WRONG_NUMBER_OF_ARGUMENTS_FOR_ASSERT,
   YIELDING_MODIFIER_ON_ARROW_BODY,
 }
 
-const _KIND_TO_STRING_MAP = const <MessageKind, String>{
-  MessageKind.ABSTRACT_CLASS_INSTANTIATION: "ABSTRACT_CLASS_INSTANTIATION",
-  MessageKind.ABSTRACT_GETTER: "ABSTRACT_GETTER",
-  MessageKind.ABSTRACT_METHOD: "ABSTRACT_METHOD",
-  MessageKind.ABSTRACT_SETTER: "ABSTRACT_SETTER",
-  MessageKind.ACCESSED_IN_CLOSURE: "ACCESSED_IN_CLOSURE",
-  MessageKind.ACCESSED_IN_CLOSURE_HERE: "ACCESSED_IN_CLOSURE_HERE",
-  MessageKind.ADDITIONAL_ARGUMENT: "ADDITIONAL_ARGUMENT",
-  MessageKind.ADDITIONAL_TYPE_ARGUMENT: "ADDITIONAL_TYPE_ARGUMENT",
-  MessageKind.ALREADY_INITIALIZED: "ALREADY_INITIALIZED",
-  MessageKind.AMBIGUOUS_LOCATION: "AMBIGUOUS_LOCATION",
-  MessageKind.AMBIGUOUS_REEXPORT: "AMBIGUOUS_REEXPORT",
-  MessageKind.ASSERT_IS_GIVEN_NAMED_ARGUMENTS:
-      "ASSERT_IS_GIVEN_NAMED_ARGUMENTS",
-  MessageKind.ASSIGNING_FINAL_FIELD_IN_SUPER: "ASSIGNING_FINAL_FIELD_IN_SUPER",
-  MessageKind.ASSIGNING_METHOD: "ASSIGNING_METHOD",
-  MessageKind.ASSIGNING_METHOD_IN_SUPER: "ASSIGNING_METHOD_IN_SUPER",
-  MessageKind.ASSIGNING_TYPE: "ASSIGNING_TYPE",
-  MessageKind.ASYNC_KEYWORD_AS_IDENTIFIER: "ASYNC_KEYWORD_AS_IDENTIFIER",
-  MessageKind.ASYNC_MODIFIER_ON_ABSTRACT_METHOD:
-      "ASYNC_MODIFIER_ON_ABSTRACT_METHOD",
-  MessageKind.ASYNC_MODIFIER_ON_CONSTRUCTOR: "ASYNC_MODIFIER_ON_CONSTRUCTOR",
-  MessageKind.ASYNC_MODIFIER_ON_SETTER: "ASYNC_MODIFIER_ON_SETTER",
-  MessageKind.AWAIT_MEMBER_NOT_FOUND: "AWAIT_MEMBER_NOT_FOUND",
-  MessageKind.AWAIT_MEMBER_NOT_FOUND_IN_CLOSURE:
-      "AWAIT_MEMBER_NOT_FOUND_IN_CLOSURE",
-  MessageKind.BAD_INPUT_CHARACTER: "BAD_INPUT_CHARACTER",
-  MessageKind.BEFORE_TOP_LEVEL: "BEFORE_TOP_LEVEL",
-  MessageKind.BINARY_OPERATOR_BAD_ARITY: "BINARY_OPERATOR_BAD_ARITY",
-  MessageKind.BODY_EXPECTED: "BODY_EXPECTED",
-  MessageKind.CALL_NOT_SUPPORTED_ON_NATIVE_CLASS:
-      "CALL_NOT_SUPPORTED_ON_NATIVE_CLASS",
-  MessageKind.CANNOT_EXTEND: "CANNOT_EXTEND",
-  MessageKind.CANNOT_EXTEND_ENUM: "CANNOT_EXTEND_ENUM",
-  MessageKind.CANNOT_EXTEND_MALFORMED: "CANNOT_EXTEND_MALFORMED",
-  MessageKind.CANNOT_FIND_CONSTRUCTOR: "CANNOT_FIND_CONSTRUCTOR",
-  MessageKind.CANNOT_FIND_UNNAMED_CONSTRUCTOR:
-      "CANNOT_FIND_UNNAMED_CONSTRUCTOR",
-  MessageKind.CANNOT_IMPLEMENT: "CANNOT_IMPLEMENT",
-  MessageKind.CANNOT_IMPLEMENT_ENUM: "CANNOT_IMPLEMENT_ENUM",
-  MessageKind.CANNOT_IMPLEMENT_MALFORMED: "CANNOT_IMPLEMENT_MALFORMED",
-  MessageKind.CANNOT_INSTANTIATE_ENUM: "CANNOT_INSTANTIATE_ENUM",
-  MessageKind.CANNOT_INSTANTIATE_TYPE_VARIABLE:
-      "CANNOT_INSTANTIATE_TYPE_VARIABLE",
-  MessageKind.CANNOT_INSTANTIATE_TYPEDEF: "CANNOT_INSTANTIATE_TYPEDEF",
-  MessageKind.CANNOT_MIXIN: "CANNOT_MIXIN",
-  MessageKind.CANNOT_MIXIN_ENUM: "CANNOT_MIXIN_ENUM",
-  MessageKind.CANNOT_MIXIN_MALFORMED: "CANNOT_MIXIN_MALFORMED",
-  MessageKind.CANNOT_OVERRIDE_FIELD_WITH_METHOD:
-      "CANNOT_OVERRIDE_FIELD_WITH_METHOD",
-  MessageKind.CANNOT_OVERRIDE_FIELD_WITH_METHOD_CONT:
-      "CANNOT_OVERRIDE_FIELD_WITH_METHOD_CONT",
-  MessageKind.CANNOT_OVERRIDE_GETTER_WITH_METHOD:
-      "CANNOT_OVERRIDE_GETTER_WITH_METHOD",
-  MessageKind.CANNOT_OVERRIDE_GETTER_WITH_METHOD_CONT:
-      "CANNOT_OVERRIDE_GETTER_WITH_METHOD_CONT",
-  MessageKind.CANNOT_OVERRIDE_METHOD_WITH_FIELD:
-      "CANNOT_OVERRIDE_METHOD_WITH_FIELD",
-  MessageKind.CANNOT_OVERRIDE_METHOD_WITH_FIELD_CONT:
-      "CANNOT_OVERRIDE_METHOD_WITH_FIELD_CONT",
-  MessageKind.CANNOT_OVERRIDE_METHOD_WITH_GETTER:
-      "CANNOT_OVERRIDE_METHOD_WITH_GETTER",
-  MessageKind.CANNOT_OVERRIDE_METHOD_WITH_GETTER_CONT:
-      "CANNOT_OVERRIDE_METHOD_WITH_GETTER_CONT",
-  MessageKind.CANNOT_RESOLVE: "CANNOT_RESOLVE",
-  MessageKind.CANNOT_RESOLVE_AWAIT: "CANNOT_RESOLVE_AWAIT",
-  MessageKind.CANNOT_RESOLVE_AWAIT_IN_CLOSURE:
-      "CANNOT_RESOLVE_AWAIT_IN_CLOSURE",
-  MessageKind.CANNOT_RESOLVE_CONSTRUCTOR: "CANNOT_RESOLVE_CONSTRUCTOR",
-  MessageKind.CANNOT_RESOLVE_CONSTRUCTOR_FOR_IMPLICIT:
-      "CANNOT_RESOLVE_CONSTRUCTOR_FOR_IMPLICIT",
-  MessageKind.CANNOT_RESOLVE_GETTER: "CANNOT_RESOLVE_GETTER",
-  MessageKind.CANNOT_RESOLVE_IN_INITIALIZER: "CANNOT_RESOLVE_IN_INITIALIZER",
-  MessageKind.CANNOT_RESOLVE_SETTER: "CANNOT_RESOLVE_SETTER",
-  MessageKind.CANNOT_RESOLVE_TYPE: "CANNOT_RESOLVE_TYPE",
-  MessageKind.CANNOT_RETURN_FROM_CONSTRUCTOR: "CANNOT_RETURN_FROM_CONSTRUCTOR",
-  MessageKind.CLASS_NAME_EXPECTED: "CLASS_NAME_EXPECTED",
-  MessageKind.COMPILER_CRASHED: "COMPILER_CRASHED",
-  MessageKind.COMPLEX_RETURNING_NSM: "COMPLEX_RETURNING_NSM",
-  MessageKind.COMPLEX_THROWING_NSM: "COMPLEX_THROWING_NSM",
-  MessageKind.CONSIDER_ANALYZE_ALL: "CONSIDER_ANALYZE_ALL",
-  MessageKind.CONST_CALLS_NON_CONST: "CONST_CALLS_NON_CONST",
-  MessageKind.CONST_CALLS_NON_CONST_FOR_IMPLICIT:
-      "CONST_CALLS_NON_CONST_FOR_IMPLICIT",
-  MessageKind.CONST_CONSTRUCTOR_HAS_BODY: "CONST_CONSTRUCTOR_HAS_BODY",
-  MessageKind.CONST_CONSTRUCTOR_WITH_NONFINAL_FIELDS:
-      "CONST_CONSTRUCTOR_WITH_NONFINAL_FIELDS",
-  MessageKind.CONST_CONSTRUCTOR_WITH_NONFINAL_FIELDS_CONSTRUCTOR:
-      "CONST_CONSTRUCTOR_WITH_NONFINAL_FIELDS_CONSTRUCTOR",
-  MessageKind.CONST_CONSTRUCTOR_WITH_NONFINAL_FIELDS_FIELD:
-      "CONST_CONSTRUCTOR_WITH_NONFINAL_FIELDS_FIELD",
-  MessageKind.CONST_LOOP_VARIABLE: "CONST_LOOP_VARIABLE",
-  MessageKind.CONST_MAP_KEY_OVERRIDES_EQUALS: "CONST_MAP_KEY_OVERRIDES_EQUALS",
-  MessageKind.CONST_WITHOUT_INITIALIZER: "CONST_WITHOUT_INITIALIZER",
-  MessageKind.CONSTRUCTOR_CALL_EXPECTED: "CONSTRUCTOR_CALL_EXPECTED",
-  MessageKind.CONSTRUCTOR_IS_NOT_CONST: "CONSTRUCTOR_IS_NOT_CONST",
-  MessageKind.CONSTRUCTOR_WITH_RETURN_TYPE: "CONSTRUCTOR_WITH_RETURN_TYPE",
-  MessageKind.CYCLIC_CLASS_HIERARCHY: "CYCLIC_CLASS_HIERARCHY",
-  MessageKind.CYCLIC_COMPILE_TIME_CONSTANTS: "CYCLIC_COMPILE_TIME_CONSTANTS",
-  MessageKind.CYCLIC_REDIRECTING_FACTORY: "CYCLIC_REDIRECTING_FACTORY",
-  MessageKind.CYCLIC_TYPE_VARIABLE: "CYCLIC_TYPE_VARIABLE",
-  MessageKind.CYCLIC_TYPEDEF: "CYCLIC_TYPEDEF",
-  MessageKind.CYCLIC_TYPEDEF_ONE: "CYCLIC_TYPEDEF_ONE",
-  MessageKind.DART_EXT_NOT_SUPPORTED: "DART_EXT_NOT_SUPPORTED",
-  MessageKind.DEFERRED_COMPILE_TIME_CONSTANT: "DEFERRED_COMPILE_TIME_CONSTANT",
-  MessageKind.DEFERRED_COMPILE_TIME_CONSTANT_CONSTRUCTION:
-      "DEFERRED_COMPILE_TIME_CONSTANT_CONSTRUCTION",
-  MessageKind.DEFERRED_LIBRARY_DART_2_DART: "DEFERRED_LIBRARY_DART_2_DART",
-  MessageKind.DEFERRED_LIBRARY_DUPLICATE_PREFIX:
-      "DEFERRED_LIBRARY_DUPLICATE_PREFIX",
-  MessageKind.DEFERRED_LIBRARY_WITHOUT_PREFIX:
-      "DEFERRED_LIBRARY_WITHOUT_PREFIX",
-  MessageKind.DEFERRED_OLD_SYNTAX: "DEFERRED_OLD_SYNTAX",
-  MessageKind.DEFERRED_TYPE_ANNOTATION: "DEFERRED_TYPE_ANNOTATION",
-  MessageKind.DEPRECATED_TYPEDEF_MIXIN_SYNTAX:
-      "DEPRECATED_TYPEDEF_MIXIN_SYNTAX",
-  MessageKind.DIRECTLY_THROWING_NSM: "DIRECTLY_THROWING_NSM",
-  MessageKind.DISALLOWED_LIBRARY_IMPORT: "DISALLOWED_LIBRARY_IMPORT",
-  MessageKind.DUPLICATE_DEFINITION: "DUPLICATE_DEFINITION",
-  MessageKind.DUPLICATE_EXPORT: "DUPLICATE_EXPORT",
-  MessageKind.DUPLICATE_EXPORT_CONT: "DUPLICATE_EXPORT_CONT",
-  MessageKind.DUPLICATE_EXPORT_DECL: "DUPLICATE_EXPORT_DECL",
-  MessageKind.DUPLICATE_EXTENDS_IMPLEMENTS: "DUPLICATE_EXTENDS_IMPLEMENTS",
-  MessageKind.DUPLICATE_IMPLEMENTS: "DUPLICATE_IMPLEMENTS",
-  MessageKind.DUPLICATE_IMPORT: "DUPLICATE_IMPORT",
-  MessageKind.DUPLICATE_INITIALIZER: "DUPLICATE_INITIALIZER",
-  MessageKind.DUPLICATE_LABEL: "DUPLICATE_LABEL",
-  MessageKind.DUPLICATE_SUPER_INITIALIZER: "DUPLICATE_SUPER_INITIALIZER",
-  MessageKind.DUPLICATE_TYPE_VARIABLE_NAME: "DUPLICATE_TYPE_VARIABLE_NAME",
-  MessageKind.DUPLICATED_LIBRARY_NAME: "DUPLICATED_LIBRARY_NAME",
-  MessageKind.DUPLICATED_LIBRARY_RESOURCE: "DUPLICATED_LIBRARY_RESOURCE",
-  MessageKind.DUPLICATED_PART_OF: "DUPLICATED_PART_OF",
-  MessageKind.DUPLICATED_RESOURCE: "DUPLICATED_RESOURCE",
-  MessageKind.EMPTY_CATCH_DECLARATION: "EMPTY_CATCH_DECLARATION",
-  MessageKind.EMPTY_ENUM_DECLARATION: "EMPTY_ENUM_DECLARATION",
-  MessageKind.EMPTY_HIDE: "EMPTY_HIDE",
-  MessageKind.EQUAL_MAP_ENTRY_KEY: "EQUAL_MAP_ENTRY_KEY",
-  MessageKind.EMPTY_SHOW: "EMPTY_SHOW",
-  MessageKind.EXISTING_DEFINITION: "EXISTING_DEFINITION",
-  MessageKind.EXISTING_LABEL: "EXISTING_LABEL",
-  MessageKind.EXPECTED_IDENTIFIER_NOT_RESERVED_WORD:
-      "EXPECTED_IDENTIFIER_NOT_RESERVED_WORD",
-  MessageKind.EXPERIMENTAL_ASSERT_MESSAGE: "EXPERIMENTAL_ASSERT_MESSAGE",
-  MessageKind.EXPONENT_MISSING: "EXPONENT_MISSING",
-  MessageKind.EXPORT_BEFORE_PARTS: "EXPORT_BEFORE_PARTS",
-  MessageKind.EXTERNAL_WITH_BODY: "EXTERNAL_WITH_BODY",
-  MessageKind.EXTRA_CATCH_DECLARATION: "EXTRA_CATCH_DECLARATION",
-  MessageKind.EXTRA_FORMALS: "EXTRA_FORMALS",
-  MessageKind.EXTRANEOUS_MODIFIER: "EXTRANEOUS_MODIFIER",
-  MessageKind.EXTRANEOUS_MODIFIER_REPLACE: "EXTRANEOUS_MODIFIER_REPLACE",
-  MessageKind.FACTORY_REDIRECTION_IN_NON_FACTORY:
-      "FACTORY_REDIRECTION_IN_NON_FACTORY",
-  MessageKind.FINAL_FUNCTION_TYPE_PARAMETER: "FINAL_FUNCTION_TYPE_PARAMETER",
-  MessageKind.FINAL_WITHOUT_INITIALIZER: "FINAL_WITHOUT_INITIALIZER",
-  MessageKind.FORIN_NOT_ASSIGNABLE: "FORIN_NOT_ASSIGNABLE",
-  MessageKind.FORMAL_DECLARED_CONST: "FORMAL_DECLARED_CONST",
-  MessageKind.FORMAL_DECLARED_STATIC: "FORMAL_DECLARED_STATIC",
-  MessageKind.FUNCTION_TYPE_FORMAL_WITH_DEFAULT:
-      "FUNCTION_TYPE_FORMAL_WITH_DEFAULT",
-  MessageKind.FUNCTION_WITH_INITIALIZER: "FUNCTION_WITH_INITIALIZER",
-  MessageKind.GENERIC: "GENERIC",
-  MessageKind.GETTER_MISMATCH: "GETTER_MISMATCH",
-  MessageKind.GETTER_NOT_FOUND: "GETTER_NOT_FOUND",
-  MessageKind.HEX_DIGIT_EXPECTED: "HEX_DIGIT_EXPECTED",
-  MessageKind.HIDDEN_HINTS: "HIDDEN_HINTS",
-  MessageKind.HIDDEN_IMPLICIT_IMPORT: "HIDDEN_IMPLICIT_IMPORT",
-  MessageKind.HIDDEN_IMPORT: "HIDDEN_IMPORT",
-  MessageKind.HIDDEN_WARNINGS: "HIDDEN_WARNINGS",
-  MessageKind.HIDDEN_WARNINGS_HINTS: "HIDDEN_WARNINGS_HINTS",
-  MessageKind.IF_NULL_ASSIGNING_TYPE: "IF_NULL_ASSIGNING_TYPE",
-  MessageKind.ILLEGAL_CONST_FIELD_MODIFIER: "ILLEGAL_CONST_FIELD_MODIFIER",
-  MessageKind.ILLEGAL_CONSTRUCTOR_MODIFIERS: "ILLEGAL_CONSTRUCTOR_MODIFIERS",
-  MessageKind.ILLEGAL_FINAL_METHOD_MODIFIER: "ILLEGAL_FINAL_METHOD_MODIFIER",
-  MessageKind.ILLEGAL_MIXIN_APPLICATION_MODIFIERS:
-      "ILLEGAL_MIXIN_APPLICATION_MODIFIERS",
-  MessageKind.ILLEGAL_MIXIN_CONSTRUCTOR: "ILLEGAL_MIXIN_CONSTRUCTOR",
-  MessageKind.ILLEGAL_MIXIN_CYCLE: "ILLEGAL_MIXIN_CYCLE",
-  MessageKind.ILLEGAL_MIXIN_OBJECT: "ILLEGAL_MIXIN_OBJECT",
-  MessageKind.ILLEGAL_MIXIN_SUPER_USE: "ILLEGAL_MIXIN_SUPER_USE",
-  MessageKind.ILLEGAL_MIXIN_SUPERCLASS: "ILLEGAL_MIXIN_SUPERCLASS",
-  MessageKind.ILLEGAL_MIXIN_WITH_SUPER: "ILLEGAL_MIXIN_WITH_SUPER",
-  MessageKind.ILLEGAL_SETTER_FORMALS: "ILLEGAL_SETTER_FORMALS",
-  MessageKind.ILLEGAL_STATIC: "ILLEGAL_STATIC",
-  MessageKind.ILLEGAL_SUPER_SEND: "ILLEGAL_SUPER_SEND",
-  MessageKind.IMPORT_BEFORE_PARTS: "IMPORT_BEFORE_PARTS",
-  MessageKind.IMPORT_EXPERIMENTAL_MIRRORS: "IMPORT_EXPERIMENTAL_MIRRORS",
-  MessageKind.IMPORT_PART_OF: "IMPORT_PART_OF",
-  MessageKind.IMPORT_PART_OF_HERE: "IMPORT_PART_OF_HERE",
-  MessageKind.IMPORTED_HERE: "IMPORTED_HERE",
-  MessageKind.INHERIT_GETTER_AND_METHOD: "INHERIT_GETTER_AND_METHOD",
-  MessageKind.INHERITED_EXPLICIT_GETTER: "INHERITED_EXPLICIT_GETTER",
-  MessageKind.INHERITED_IMPLICIT_GETTER: "INHERITED_IMPLICIT_GETTER",
-  MessageKind.INHERITED_METHOD: "INHERITED_METHOD",
-  MessageKind.INJECTED_PUBLIC_MEMBER: "INJECTED_PUBLIC_MEMBER",
-  MessageKind.INIT_STATIC_FIELD: "INIT_STATIC_FIELD",
-  MessageKind.INITIALIZING_FORMAL_NOT_ALLOWED:
-      "INITIALIZING_FORMAL_NOT_ALLOWED",
-  MessageKind.INSTANCE_STATIC_SAME_NAME: "INSTANCE_STATIC_SAME_NAME",
-  MessageKind.INSTANCE_STATIC_SAME_NAME_CONT: "INSTANCE_STATIC_SAME_NAME_CONT",
-  MessageKind.INTERNAL_LIBRARY: "INTERNAL_LIBRARY",
-  MessageKind.INTERNAL_LIBRARY_FROM: "INTERNAL_LIBRARY_FROM",
-  MessageKind.INVALID_ARGUMENT_AFTER_NAMED: "INVALID_ARGUMENT_AFTER_NAMED",
-  MessageKind.INVALID_AWAIT: "INVALID_AWAIT",
-  MessageKind.INVALID_AWAIT_FOR: "INVALID_AWAIT_FOR",
-  MessageKind.INVALID_AWAIT_FOR_IN: "INVALID_AWAIT_FOR_IN",
-  MessageKind.INVALID_BREAK: "INVALID_BREAK",
-  MessageKind.INVALID_CASE_DEFAULT: "INVALID_CASE_DEFAULT",
-  MessageKind.INVALID_CONSTRUCTOR_ARGUMENTS: "INVALID_CONSTRUCTOR_ARGUMENTS",
-  MessageKind.INVALID_CONSTRUCTOR_NAME: "INVALID_CONSTRUCTOR_NAME",
-  MessageKind.INVALID_CONTINUE: "INVALID_CONTINUE",
-  MessageKind.INVALID_FOR_IN: "INVALID_FOR_IN",
-  MessageKind.INVALID_INITIALIZER: "INVALID_INITIALIZER",
-  MessageKind.INVALID_METADATA: "INVALID_METADATA",
-  MessageKind.INVALID_METADATA_GENERIC: "INVALID_METADATA_GENERIC",
-  MessageKind.INVALID_OVERRIDDEN_FIELD: "INVALID_OVERRIDDEN_FIELD",
-  MessageKind.INVALID_OVERRIDDEN_GETTER: "INVALID_OVERRIDDEN_GETTER",
-  MessageKind.INVALID_OVERRIDDEN_METHOD: "INVALID_OVERRIDDEN_METHOD",
-  MessageKind.INVALID_OVERRIDDEN_SETTER: "INVALID_OVERRIDDEN_SETTER",
-  MessageKind.INVALID_OVERRIDE_FIELD: "INVALID_OVERRIDE_FIELD",
-  MessageKind.INVALID_OVERRIDE_FIELD_WITH_GETTER:
-      "INVALID_OVERRIDE_FIELD_WITH_GETTER",
-  MessageKind.INVALID_OVERRIDE_FIELD_WITH_SETTER:
-      "INVALID_OVERRIDE_FIELD_WITH_SETTER",
-  MessageKind.INVALID_OVERRIDE_GETTER: "INVALID_OVERRIDE_GETTER",
-  MessageKind.INVALID_OVERRIDE_GETTER_WITH_FIELD:
-      "INVALID_OVERRIDE_GETTER_WITH_FIELD",
-  MessageKind.INVALID_OVERRIDE_METHOD: "INVALID_OVERRIDE_METHOD",
-  MessageKind.INVALID_OVERRIDE_SETTER: "INVALID_OVERRIDE_SETTER",
-  MessageKind.INVALID_OVERRIDE_SETTER_WITH_FIELD:
-      "INVALID_OVERRIDE_SETTER_WITH_FIELD",
-  MessageKind.INVALID_PACKAGE_CONFIG: "INVALID_PACKAGE_CONFIG",
-  MessageKind.INVALID_PACKAGE_URI: "INVALID_PACKAGE_URI",
-  MessageKind.INVALID_PARAMETER: "INVALID_PARAMETER",
-  MessageKind.INVALID_RECEIVER_IN_INITIALIZER:
-      "INVALID_RECEIVER_IN_INITIALIZER",
-  MessageKind.INVALID_SOURCE_FILE_LOCATION: "INVALID_SOURCE_FILE_LOCATION",
-  MessageKind.INVALID_SYMBOL: "INVALID_SYMBOL",
-  MessageKind.INVALID_SYNC_MODIFIER: "INVALID_SYNC_MODIFIER",
-  MessageKind.INVALID_TYPE_VARIABLE_BOUND: "INVALID_TYPE_VARIABLE_BOUND",
-  MessageKind.INVALID_UNNAMED_CONSTRUCTOR_NAME:
-      "INVALID_UNNAMED_CONSTRUCTOR_NAME",
-  MessageKind.INVALID_URI: "INVALID_URI",
-  MessageKind.INVALID_USE_OF_SUPER: "INVALID_USE_OF_SUPER",
-  MessageKind.INVALID_YIELD: "INVALID_YIELD",
-  MessageKind.JS_INTEROP_CLASS_CANNOT_EXTEND_DART_CLASS:
-      "JS_INTEROP_CLASS_CANNOT_EXTEND_DART_CLASS",
-  MessageKind.JS_INTEROP_CLASS_NON_EXTERNAL_MEMBER:
-      "JS_INTEROP_CLASS_NON_EXTERNAL_MEMBER",
-  MessageKind.JS_OBJECT_LITERAL_CONSTRUCTOR_WITH_POSITIONAL_ARGUMENTS:
-      "JS_OBJECT_LITERAL_CONSTRUCTOR_WITH_POSITIONAL_ARGUMENTS",
-  MessageKind.JS_INTEROP_METHOD_WITH_NAMED_ARGUMENTS:
-      "JS_INTEROP_METHOD_WITH_NAMED_ARGUMENTS",
-  MessageKind.JS_PLACEHOLDER_CAPTURE: "JS_PLACEHOLDER_CAPTURE",
-  MessageKind.LIBRARY_NAME_MISMATCH: "LIBRARY_NAME_MISMATCH",
-  MessageKind.LIBRARY_NOT_FOUND: "LIBRARY_NOT_FOUND",
-  MessageKind.LIBRARY_NOT_SUPPORTED: "LIBRARY_NOT_SUPPORTED",
-  MessageKind.LIBRARY_TAG_MUST_BE_FIRST: "LIBRARY_TAG_MUST_BE_FIRST",
-  MessageKind.MAIN_HAS_PART_OF: "MAIN_HAS_PART_OF",
-  MessageKind.MAIN_NOT_A_FUNCTION: "MAIN_NOT_A_FUNCTION",
-  MessageKind.MAIN_WITH_EXTRA_PARAMETER: "MAIN_WITH_EXTRA_PARAMETER",
-  MessageKind.MALFORMED_STRING_LITERAL: "MALFORMED_STRING_LITERAL",
-  MessageKind.MEMBER_NOT_FOUND: "MEMBER_NOT_FOUND",
-  MessageKind.MEMBER_NOT_STATIC: "MEMBER_NOT_STATIC",
-  MessageKind.MEMBER_USES_CLASS_NAME: "MEMBER_USES_CLASS_NAME",
-  MessageKind.METHOD_NOT_FOUND: "METHOD_NOT_FOUND",
-  MessageKind.MINUS_OPERATOR_BAD_ARITY: "MINUS_OPERATOR_BAD_ARITY",
-  MessageKind.MIRROR_BLOAT: "MIRROR_BLOAT",
-  MessageKind.MIRROR_IMPORT: "MIRROR_IMPORT",
-  MessageKind.MIRROR_IMPORT_NO_USAGE: "MIRROR_IMPORT_NO_USAGE",
-  MessageKind.MIRRORS_CANNOT_FIND_IN_ELEMENT: "MIRRORS_CANNOT_FIND_IN_ELEMENT",
-  MessageKind.MIRRORS_CANNOT_RESOLVE_IN_CURRENT_LIBRARY:
-      "MIRRORS_CANNOT_RESOLVE_IN_CURRENT_LIBRARY",
-  MessageKind.MIRRORS_CANNOT_RESOLVE_IN_LIBRARY:
-      "MIRRORS_CANNOT_RESOLVE_IN_LIBRARY",
-  MessageKind.MIRRORS_EXPECTED_STRING: "MIRRORS_EXPECTED_STRING",
-  MessageKind.MIRRORS_EXPECTED_STRING_OR_LIST:
-      "MIRRORS_EXPECTED_STRING_OR_LIST",
-  MessageKind.MIRRORS_EXPECTED_STRING_OR_TYPE:
-      "MIRRORS_EXPECTED_STRING_OR_TYPE",
-  MessageKind.MIRRORS_EXPECTED_STRING_TYPE_OR_LIST:
-      "MIRRORS_EXPECTED_STRING_TYPE_OR_LIST",
-  MessageKind.MIRRORS_LIBRARY_NOT_SUPPORT_BY_BACKEND:
-      "MIRRORS_LIBRARY_NOT_SUPPORT_BY_BACKEND",
-  MessageKind.MISSING_ARGUMENT: "MISSING_ARGUMENT",
-  MessageKind.MISSING_ENUM_CASES: "MISSING_ENUM_CASES",
-  MessageKind.MISSING_FACTORY_KEYWORD: "MISSING_FACTORY_KEYWORD",
-  MessageKind.MISSING_FORMALS: "MISSING_FORMALS",
-  MessageKind.MISSING_LIBRARY_NAME: "MISSING_LIBRARY_NAME",
-  MessageKind.MISSING_MAIN: "MISSING_MAIN",
-  MessageKind.MISSING_PART_OF_TAG: "MISSING_PART_OF_TAG",
-  MessageKind.MISSING_TOKEN_AFTER_THIS: "MISSING_TOKEN_AFTER_THIS",
-  MessageKind.MISSING_TOKEN_BEFORE_THIS: "MISSING_TOKEN_BEFORE_THIS",
-  MessageKind.MISSING_TYPE_ARGUMENT: "MISSING_TYPE_ARGUMENT",
-  MessageKind.MULTI_INHERITANCE: "MULTI_INHERITANCE",
-  MessageKind.NAMED_ARGUMENT_NOT_FOUND: "NAMED_ARGUMENT_NOT_FOUND",
-  MessageKind.NAMED_FUNCTION_EXPRESSION: "NAMED_FUNCTION_EXPRESSION",
-  MessageKind.NAMED_PARAMETER_WITH_EQUALS: "NAMED_PARAMETER_WITH_EQUALS",
-  MessageKind.NATIVE_NOT_SUPPORTED: "NATIVE_NOT_SUPPORTED",
-  MessageKind.NO_BREAK_TARGET: "NO_BREAK_TARGET",
-  MessageKind.NO_CATCH_NOR_FINALLY: "NO_CATCH_NOR_FINALLY",
-  MessageKind.NO_COMMON_SUBTYPES: "NO_COMMON_SUBTYPES",
-  MessageKind.NO_CONTINUE_TARGET: "NO_CONTINUE_TARGET",
-  MessageKind.NO_INSTANCE_AVAILABLE: "NO_INSTANCE_AVAILABLE",
-  MessageKind.NO_MATCHING_CONSTRUCTOR: "NO_MATCHING_CONSTRUCTOR",
-  MessageKind.NO_MATCHING_CONSTRUCTOR_FOR_IMPLICIT:
-      "NO_MATCHING_CONSTRUCTOR_FOR_IMPLICIT",
-  MessageKind.NO_STATIC_OVERRIDE: "NO_STATIC_OVERRIDE",
-  MessageKind.NO_STATIC_OVERRIDE_CONT: "NO_STATIC_OVERRIDE_CONT",
-  MessageKind.NO_SUCH_LIBRARY_MEMBER: "NO_SUCH_LIBRARY_MEMBER",
-  MessageKind.NO_SUCH_METHOD_IN_NATIVE: "NO_SUCH_METHOD_IN_NATIVE",
-  MessageKind.NO_SUCH_SUPER_MEMBER: "NO_SUCH_SUPER_MEMBER",
-  MessageKind.NO_SUPER_IN_STATIC: "NO_SUPER_IN_STATIC",
-  MessageKind.NO_THIS_AVAILABLE: "NO_THIS_AVAILABLE",
-  MessageKind.NON_CONST_BLOAT: "NON_CONST_BLOAT",
-  MessageKind.NOT_A_COMPILE_TIME_CONSTANT: "NOT_A_COMPILE_TIME_CONSTANT",
-  MessageKind.NOT_A_FIELD: "NOT_A_FIELD",
-  MessageKind.NOT_A_PREFIX: "NOT_A_PREFIX",
-  MessageKind.NOT_A_TYPE: "NOT_A_TYPE",
-  MessageKind.NOT_ASSIGNABLE: "NOT_ASSIGNABLE",
-  MessageKind.NOT_CALLABLE: "NOT_CALLABLE",
-  MessageKind.NOT_INSTANCE_FIELD: "NOT_INSTANCE_FIELD",
-  MessageKind.NOT_MORE_SPECIFIC: "NOT_MORE_SPECIFIC",
-  MessageKind.NOT_MORE_SPECIFIC_SUBTYPE: "NOT_MORE_SPECIFIC_SUBTYPE",
-  MessageKind.NOT_MORE_SPECIFIC_SUGGESTION: "NOT_MORE_SPECIFIC_SUGGESTION",
-  MessageKind.NULL_NOT_ALLOWED: "NULL_NOT_ALLOWED",
-  MessageKind.ONLY_ONE_LIBRARY_TAG: "ONLY_ONE_LIBRARY_TAG",
-  MessageKind.OPERATOR_NAMED_PARAMETERS: "OPERATOR_NAMED_PARAMETERS",
-  MessageKind.OPERATOR_NOT_FOUND: "OPERATOR_NOT_FOUND",
-  MessageKind.OPERATOR_OPTIONAL_PARAMETERS: "OPERATOR_OPTIONAL_PARAMETERS",
-  MessageKind.OPTIONAL_PARAMETER_IN_CATCH: "OPTIONAL_PARAMETER_IN_CATCH",
-  MessageKind.OVERRIDE_EQUALS_NOT_HASH_CODE: "OVERRIDE_EQUALS_NOT_HASH_CODE",
-  MessageKind.PARAMETER_NAME_EXPECTED: "PARAMETER_NAME_EXPECTED",
-  MessageKind.PARAMETER_WITH_MODIFIER_IN_CATCH:
-      "PARAMETER_WITH_MODIFIER_IN_CATCH",
-  MessageKind.PARAMETER_WITH_TYPE_IN_CATCH: "PARAMETER_WITH_TYPE_IN_CATCH",
-  MessageKind.PATCH_EXTERNAL_WITHOUT_IMPLEMENTATION:
-      "PATCH_EXTERNAL_WITHOUT_IMPLEMENTATION",
-  MessageKind.PATCH_NO_GETTER: "PATCH_NO_GETTER",
-  MessageKind.PATCH_NO_SETTER: "PATCH_NO_SETTER",
-  MessageKind.PATCH_NON_CLASS: "PATCH_NON_CLASS",
-  MessageKind.PATCH_NON_CONSTRUCTOR: "PATCH_NON_CONSTRUCTOR",
-  MessageKind.PATCH_NON_EXISTING: "PATCH_NON_EXISTING",
-  MessageKind.PATCH_NON_EXTERNAL: "PATCH_NON_EXTERNAL",
-  MessageKind.PATCH_NON_FUNCTION: "PATCH_NON_FUNCTION",
-  MessageKind.PATCH_NON_GETTER: "PATCH_NON_GETTER",
-  MessageKind.PATCH_NON_SETTER: "PATCH_NON_SETTER",
-  MessageKind.PATCH_NONPATCHABLE: "PATCH_NONPATCHABLE",
-  MessageKind.PATCH_OPTIONAL_PARAMETER_COUNT_MISMATCH:
-      "PATCH_OPTIONAL_PARAMETER_COUNT_MISMATCH",
-  MessageKind.PATCH_OPTIONAL_PARAMETER_NAMED_MISMATCH:
-      "PATCH_OPTIONAL_PARAMETER_NAMED_MISMATCH",
-  MessageKind.PATCH_PARAMETER_MISMATCH: "PATCH_PARAMETER_MISMATCH",
-  MessageKind.PATCH_PARAMETER_TYPE_MISMATCH: "PATCH_PARAMETER_TYPE_MISMATCH",
-  MessageKind.PATCH_POINT_TO_CLASS: "PATCH_POINT_TO_CLASS",
-  MessageKind.PATCH_POINT_TO_CONSTRUCTOR: "PATCH_POINT_TO_CONSTRUCTOR",
-  MessageKind.PATCH_POINT_TO_FUNCTION: "PATCH_POINT_TO_FUNCTION",
-  MessageKind.PATCH_POINT_TO_GETTER: "PATCH_POINT_TO_GETTER",
-  MessageKind.PATCH_POINT_TO_PARAMETER: "PATCH_POINT_TO_PARAMETER",
-  MessageKind.PATCH_POINT_TO_SETTER: "PATCH_POINT_TO_SETTER",
-  MessageKind.PATCH_REQUIRED_PARAMETER_COUNT_MISMATCH:
-      "PATCH_REQUIRED_PARAMETER_COUNT_MISMATCH",
-  MessageKind.PATCH_RETURN_TYPE_MISMATCH: "PATCH_RETURN_TYPE_MISMATCH",
-  MessageKind.PLEASE_REPORT_THE_CRASH: "PLEASE_REPORT_THE_CRASH",
-  MessageKind.POSITIONAL_PARAMETER_WITH_EQUALS:
-      "POSITIONAL_PARAMETER_WITH_EQUALS",
-  MessageKind.POTENTIAL_MUTATION: "POTENTIAL_MUTATION",
-  MessageKind.POTENTIAL_MUTATION_HERE: "POTENTIAL_MUTATION_HERE",
-  MessageKind.POTENTIAL_MUTATION_IN_CLOSURE: "POTENTIAL_MUTATION_IN_CLOSURE",
-  MessageKind.POTENTIAL_MUTATION_IN_CLOSURE_HERE:
-      "POTENTIAL_MUTATION_IN_CLOSURE_HERE",
-  MessageKind.PREAMBLE: "PREAMBLE",
-  MessageKind.PREFIX_AS_EXPRESSION: "PREFIX_AS_EXPRESSION",
-  MessageKind.PRIVATE_ACCESS: "PRIVATE_ACCESS",
-  MessageKind.PRIVATE_IDENTIFIER: "PRIVATE_IDENTIFIER",
-  MessageKind.PRIVATE_NAMED_PARAMETER: "PRIVATE_NAMED_PARAMETER",
-  MessageKind.READ_SCRIPT_ERROR: "READ_SCRIPT_ERROR",
-  MessageKind.READ_SELF_ERROR: "READ_SELF_ERROR",
-  MessageKind.REDIRECTING_CONSTRUCTOR_CYCLE: "REDIRECTING_CONSTRUCTOR_CYCLE",
-  MessageKind.REDIRECTING_CONSTRUCTOR_HAS_BODY:
-      "REDIRECTING_CONSTRUCTOR_HAS_BODY",
-  MessageKind.REDIRECTING_CONSTRUCTOR_HAS_INITIALIZER:
-      "REDIRECTING_CONSTRUCTOR_HAS_INITIALIZER",
-  MessageKind.REDIRECTING_FACTORY_WITH_DEFAULT:
-      "REDIRECTING_FACTORY_WITH_DEFAULT",
-  MessageKind.REFERENCE_IN_INITIALIZATION: "REFERENCE_IN_INITIALIZATION",
-  MessageKind.REQUIRED_PARAMETER_WITH_DEFAULT:
-      "REQUIRED_PARAMETER_WITH_DEFAULT",
-  MessageKind.RETURN_IN_GENERATOR: "RETURN_IN_GENERATOR",
-  MessageKind.RETURN_NOTHING: "RETURN_NOTHING",
-  MessageKind.RETURN_VALUE_IN_VOID: "RETURN_VALUE_IN_VOID",
-  MessageKind.SETTER_MISMATCH: "SETTER_MISMATCH",
-  MessageKind.SETTER_NOT_FOUND: "SETTER_NOT_FOUND",
-  MessageKind.SETTER_NOT_FOUND_IN_SUPER: "SETTER_NOT_FOUND_IN_SUPER",
-  MessageKind.STATIC_FUNCTION_BLOAT: "STATIC_FUNCTION_BLOAT",
-  MessageKind.STRING_EXPECTED: "STRING_EXPECTED",
-  MessageKind.SUPER_CALL_TO_FACTORY: "SUPER_CALL_TO_FACTORY",
-  MessageKind.SUPER_INITIALIZER_IN_OBJECT: "SUPER_INITIALIZER_IN_OBJECT",
-  MessageKind.SWITCH_CASE_FORBIDDEN: "SWITCH_CASE_FORBIDDEN",
-  MessageKind.SWITCH_CASE_TYPES_NOT_EQUAL: "SWITCH_CASE_TYPES_NOT_EQUAL",
-  MessageKind.SWITCH_CASE_TYPES_NOT_EQUAL_CASE:
-      "SWITCH_CASE_TYPES_NOT_EQUAL_CASE",
-  MessageKind.SWITCH_CASE_VALUE_OVERRIDES_EQUALS:
-      "SWITCH_CASE_VALUE_OVERRIDES_EQUALS",
-  MessageKind.TERNARY_OPERATOR_BAD_ARITY: "TERNARY_OPERATOR_BAD_ARITY",
-  MessageKind.THIS_CALL_TO_FACTORY: "THIS_CALL_TO_FACTORY",
-  MessageKind.THIS_IS_THE_DECLARATION: "THIS_IS_THE_DECLARATION",
-  MessageKind.THIS_IS_THE_METHOD: "THIS_IS_THE_METHOD",
-  MessageKind.THIS_IS_THE_PART_OF_TAG: "THIS_IS_THE_PART_OF_TAG",
-  MessageKind.THIS_PROPERTY: "THIS_PROPERTY",
-  MessageKind.THROW_WITHOUT_EXPRESSION: "THROW_WITHOUT_EXPRESSION",
-  MessageKind.TOP_LEVEL_VARIABLE_DECLARED_STATIC:
-      "TOP_LEVEL_VARIABLE_DECLARED_STATIC",
-  MessageKind.TYPE_ARGUMENT_COUNT_MISMATCH: "TYPE_ARGUMENT_COUNT_MISMATCH",
-  MessageKind.TYPE_VARIABLE_IN_CONSTANT: "TYPE_VARIABLE_IN_CONSTANT",
-  MessageKind.TYPE_VARIABLE_WITHIN_STATIC_MEMBER:
-      "TYPE_VARIABLE_WITHIN_STATIC_MEMBER",
-  MessageKind.TYPEDEF_FORMAL_WITH_DEFAULT: "TYPEDEF_FORMAL_WITH_DEFAULT",
-  MessageKind.UNARY_OPERATOR_BAD_ARITY: "UNARY_OPERATOR_BAD_ARITY",
-  MessageKind.UNBOUND_LABEL: "UNBOUND_LABEL",
-  MessageKind.UNIMPLEMENTED_EXPLICIT_GETTER: "UNIMPLEMENTED_EXPLICIT_GETTER",
-  MessageKind.UNIMPLEMENTED_EXPLICIT_SETTER: "UNIMPLEMENTED_EXPLICIT_SETTER",
-  MessageKind.UNIMPLEMENTED_GETTER: "UNIMPLEMENTED_GETTER",
-  MessageKind.UNIMPLEMENTED_GETTER_ONE: "UNIMPLEMENTED_GETTER_ONE",
-  MessageKind.UNIMPLEMENTED_IMPLICIT_GETTER: "UNIMPLEMENTED_IMPLICIT_GETTER",
-  MessageKind.UNIMPLEMENTED_IMPLICIT_SETTER: "UNIMPLEMENTED_IMPLICIT_SETTER",
-  MessageKind.UNIMPLEMENTED_METHOD: "UNIMPLEMENTED_METHOD",
-  MessageKind.UNIMPLEMENTED_METHOD_CONT: "UNIMPLEMENTED_METHOD_CONT",
-  MessageKind.UNIMPLEMENTED_METHOD_ONE: "UNIMPLEMENTED_METHOD_ONE",
-  MessageKind.UNIMPLEMENTED_SETTER: "UNIMPLEMENTED_SETTER",
-  MessageKind.UNIMPLEMENTED_SETTER_ONE: "UNIMPLEMENTED_SETTER_ONE",
-  MessageKind.UNMATCHED_TOKEN: "UNMATCHED_TOKEN",
-  MessageKind.UNRECOGNIZED_VERSION_OF_LOOKUP_MAP:
-      "UNRECOGNIZED_VERSION_OF_LOOKUP_MAP",
-  MessageKind.UNSUPPORTED_BANG_EQ_EQ: "UNSUPPORTED_BANG_EQ_EQ",
-  MessageKind.UNSUPPORTED_EQ_EQ_EQ: "UNSUPPORTED_EQ_EQ_EQ",
-  MessageKind.UNSUPPORTED_LITERAL_SYMBOL: "UNSUPPORTED_LITERAL_SYMBOL",
-  MessageKind.UNSUPPORTED_PREFIX_PLUS: "UNSUPPORTED_PREFIX_PLUS",
-  MessageKind.UNSUPPORTED_THROW_WITHOUT_EXP: "UNSUPPORTED_THROW_WITHOUT_EXP",
-  MessageKind.UNTERMINATED_COMMENT: "UNTERMINATED_COMMENT",
-  MessageKind.UNTERMINATED_STRING: "UNTERMINATED_STRING",
-  MessageKind.UNTERMINATED_TOKEN: "UNTERMINATED_TOKEN",
-  MessageKind.UNUSED_CLASS: "UNUSED_CLASS",
-  MessageKind.UNUSED_LABEL: "UNUSED_LABEL",
-  MessageKind.UNUSED_METHOD: "UNUSED_METHOD",
-  MessageKind.UNUSED_TYPEDEF: "UNUSED_TYPEDEF",
-  MessageKind.VAR_FUNCTION_TYPE_PARAMETER: "VAR_FUNCTION_TYPE_PARAMETER",
-  MessageKind.VOID_EXPRESSION: "VOID_EXPRESSION",
-  MessageKind.VOID_NOT_ALLOWED: "VOID_NOT_ALLOWED",
-  MessageKind.VOID_VARIABLE: "VOID_VARIABLE",
-  MessageKind.WRONG_ARGUMENT_FOR_JS_INTERCEPTOR_CONSTANT:
-      "WRONG_ARGUMENT_FOR_JS_INTERCEPTOR_CONSTANT",
-  MessageKind.WRONG_NUMBER_OF_ARGUMENTS_FOR_ASSERT:
-      "WRONG_NUMBER_OF_ARGUMENTS_FOR_ASSERT",
-  MessageKind.YIELDING_MODIFIER_ON_ARROW_BODY:
-      "YIELDING_MODIFIER_ON_ARROW_BODY",
-};
-
 /// A message template for an error, warning, hint or info message generated
 /// by the compiler. Each template is associated with a [MessageKind] that
 /// uniquely identifies the message template.
 // TODO(johnnniwinther): For Infos, consider adding a reference to the
 // error/warning/hint that they belong to.
 class MessageTemplate {
   final MessageKind kind;
 
-  final String id;
-
   /// Should describe what is wrong and why.
   final String template;
 
   /// Should describe how to fix the problem. Elided when using --terse option.
   final String howToFix;
 
   /**
    *  Examples will be checked by
    *  tests/compiler/dart2js/message_kind_test.dart.
    *
    *  An example is either a String containing the example source code or a Map
    *  from filenames to source code. In the latter case, the filename for the
    *  main library code must be 'main.dart'.
    */
   final List examples;
 
   /// Additional options needed for the examples to work.
   final List<String> options;
 
-  const MessageTemplate(this.kind, this.id, this.template, this.howToFix,
-      this.examples, this.options);
+  const MessageTemplate(
+      this.kind,
+      this.template,
+      {this.howToFix,
+       this.examples,
+       this.options: const <String>[]});
+
+  /// All templates used by the compiler.
+  ///
+  /// The map is complete mapping from [MessageKind] to their corresponding
+  /// [MessageTemplate].
+  static const Map<MessageKind, MessageTemplate> TEMPLATES =
+    const <MessageKind, MessageTemplate>{
+      /// Do not use this. It is here for legacy and debugging. It violates item
+      /// 4 of the guide lines for error messages in the beginning of the file.
+      MessageKind.GENERIC:
+        const MessageTemplate(MessageKind.GENERIC, '#{text}'),
+
+      MessageKind.NOT_ASSIGNABLE:
+        const MessageTemplate(MessageKind.NOT_ASSIGNABLE,
+          "'#{fromType}' is not assignable to '#{toType}'."),
+
+      MessageKind.FORIN_NOT_ASSIGNABLE:
+        const MessageTemplate(MessageKind.FORIN_NOT_ASSIGNABLE,
+          "The element type '#{currentType}' of '#{expressionType}' "
+          "is not assignable to '#{elementType}'."),
+
+      MessageKind.VOID_EXPRESSION:
+        const MessageTemplate(MessageKind.VOID_EXPRESSION,
+          "Expression does not yield a value."),
+
+      MessageKind.VOID_VARIABLE:
+        const MessageTemplate(MessageKind.VOID_VARIABLE,
+          "Variable cannot be of type void."),
+
+      MessageKind.RETURN_VALUE_IN_VOID:
+        const MessageTemplate(MessageKind.RETURN_VALUE_IN_VOID,
+          "Cannot return value from void function."),
+
+      MessageKind.RETURN_NOTHING:
+        const MessageTemplate(MessageKind.RETURN_NOTHING,
+          "Value of type '#{returnType}' expected."),
+
+      MessageKind.MISSING_ARGUMENT:
+        const MessageTemplate(MessageKind.MISSING_ARGUMENT,
+          "Missing argument of type '#{argumentType}'."),
+
+      MessageKind.ADDITIONAL_ARGUMENT:
+        const MessageTemplate(MessageKind.ADDITIONAL_ARGUMENT,
+          "Additional argument."),
+
+      MessageKind.NAMED_ARGUMENT_NOT_FOUND:
+        const MessageTemplate(MessageKind.NAMED_ARGUMENT_NOT_FOUND,
+          "No named argument '#{argumentName}' found on method."),
+
+      MessageKind.MEMBER_NOT_FOUND:
+        const MessageTemplate(MessageKind.MEMBER_NOT_FOUND,
+          "No member named '#{memberName}' in class '#{className}'."),
+
+      MessageKind.AWAIT_MEMBER_NOT_FOUND:
+        const MessageTemplate(MessageKind.AWAIT_MEMBER_NOT_FOUND,
+          "No member named 'await' in class '#{className}'.",
+          howToFix: "Did you mean to add the 'async' marker "
+                    "to '#{functionName}'?",
+          examples: const ["""
+class A {
+  m() => await -3;
+}
+main() => new A().m();
+"""]),
+
+      MessageKind.AWAIT_MEMBER_NOT_FOUND_IN_CLOSURE:
+        const MessageTemplate(MessageKind.AWAIT_MEMBER_NOT_FOUND_IN_CLOSURE,
+          "No member named 'await' in class '#{className}'.",
+          howToFix: "Did you mean to add the 'async' marker "
+                    "to the enclosing function?",
+          examples: const ["""
+class A {
+  m() => () => await -3;
+}
+main() => new A().m();
+"""]),
+
+      MessageKind.METHOD_NOT_FOUND:
+        const MessageTemplate(MessageKind.METHOD_NOT_FOUND,
+          "No method named '#{memberName}' in class '#{className}'."),
+
+      MessageKind.OPERATOR_NOT_FOUND:
+        const MessageTemplate(MessageKind.OPERATOR_NOT_FOUND,
+          "No operator '#{memberName}' in class '#{className}'."),
+
+      MessageKind.SETTER_NOT_FOUND:
+        const MessageTemplate(MessageKind.SETTER_NOT_FOUND,
+          "No setter named '#{memberName}' in class '#{className}'."),
+
+      MessageKind.SETTER_NOT_FOUND_IN_SUPER:
+        const MessageTemplate(MessageKind.SETTER_NOT_FOUND_IN_SUPER,
+          "No setter named '#{name}' in superclass of '#{className}'."),
+
+      MessageKind.GETTER_NOT_FOUND:
+        const MessageTemplate(MessageKind.GETTER_NOT_FOUND,
+          "No getter named '#{memberName}' in class '#{className}'."),
+
+      MessageKind.NOT_CALLABLE:
+        const MessageTemplate(MessageKind.NOT_CALLABLE,
+          "'#{elementName}' is not callable."),
+
+      MessageKind.MEMBER_NOT_STATIC:
+        const MessageTemplate(MessageKind.MEMBER_NOT_STATIC,
+          "'#{className}.#{memberName}' is not static."),
+
+      MessageKind.NO_INSTANCE_AVAILABLE:
+        const MessageTemplate(MessageKind.NO_INSTANCE_AVAILABLE,
+          "'#{name}' is only available in instance methods."),
+
+      MessageKind.NO_THIS_AVAILABLE:
+        const MessageTemplate(MessageKind.NO_THIS_AVAILABLE,
+          "'this' is only available in instance methods."),
+
+      MessageKind.PRIVATE_ACCESS:
+        const MessageTemplate(MessageKind.PRIVATE_ACCESS,
+          "'#{name}' is declared private within library "
+          "'#{libraryName}'."),
+
+      MessageKind.THIS_IS_THE_DECLARATION:
+        const MessageTemplate(MessageKind.THIS_IS_THE_DECLARATION,
+          "This is the declaration of '#{name}'."),
+
+      MessageKind.THIS_IS_THE_METHOD:
+        const MessageTemplate(MessageKind.THIS_IS_THE_METHOD,
+          "This is the method declaration."),
+
+      MessageKind.CANNOT_RESOLVE:
+        const MessageTemplate(MessageKind.CANNOT_RESOLVE,
+          "Cannot resolve '#{name}'."),
+
+      MessageKind.CANNOT_RESOLVE_AWAIT:
+        const MessageTemplate(MessageKind.CANNOT_RESOLVE_AWAIT,
+          "Cannot resolve '#{name}'.",
+          howToFix: "Did you mean to add the 'async' marker "
+                    "to '#{functionName}'?",
+          examples: const [
+              "main() => await -3;",
+              "foo() => await -3; main() => foo();"
+          ]),
+
+      MessageKind.CANNOT_RESOLVE_AWAIT_IN_CLOSURE:
+        const MessageTemplate(MessageKind.CANNOT_RESOLVE_AWAIT_IN_CLOSURE,
+          "Cannot resolve '#{name}'.",
+          howToFix: "Did you mean to add the 'async' marker "
+                    "to the enclosing function?",
+          examples: const [
+              "main() { (() => await -3)(); }",
+          ]),
+
+      MessageKind.CANNOT_RESOLVE_IN_INITIALIZER:
+        const MessageTemplate(MessageKind.CANNOT_RESOLVE_IN_INITIALIZER,
+          "Cannot resolve '#{name}'. It would be implicitly looked up on this "
+          "instance, but instances are not available in initializers.",
+          howToFix: "Try correcting the unresolved reference or move the "
+              "initialization to a constructor body.",
+          examples: const ["""
+class A {
+  var test = unresolvedName;
+}
+main() => new A();
+"""]),
+
+      MessageKind.CANNOT_RESOLVE_CONSTRUCTOR:
+        const MessageTemplate(MessageKind.CANNOT_RESOLVE_CONSTRUCTOR,
+          "Cannot resolve constructor '#{constructorName}'."),
+
+      MessageKind.CANNOT_RESOLVE_CONSTRUCTOR_FOR_IMPLICIT:
+        const MessageTemplate(
+          MessageKind.CANNOT_RESOLVE_CONSTRUCTOR_FOR_IMPLICIT,
+          "cannot resolve constructor '#{constructorName}' "
+          "for implicit super call.",
+          howToFix: "Try explicitly invoking a constructor of the super class",
+          examples: const ["""
+class A {
+  A.foo() {}
+}
+class B extends A {
+  B();
+}
+main() => new B();
+"""]),
+
+      MessageKind.INVALID_UNNAMED_CONSTRUCTOR_NAME:
+        const MessageTemplate(MessageKind.INVALID_UNNAMED_CONSTRUCTOR_NAME,
+          "Unnamed constructor name must be '#{name}'."),
+
+      MessageKind.INVALID_CONSTRUCTOR_NAME:
+        const MessageTemplate(MessageKind.INVALID_CONSTRUCTOR_NAME,
+          "Constructor name must start with '#{name}'."),
+
+      MessageKind.CANNOT_RESOLVE_TYPE:
+        const MessageTemplate(MessageKind.CANNOT_RESOLVE_TYPE,
+          "Cannot resolve type '#{typeName}'."),
+
+      MessageKind.DUPLICATE_DEFINITION:
+        const MessageTemplate(MessageKind.DUPLICATE_DEFINITION,
+          "Duplicate definition of '#{name}'.",
+          howToFix: "Try to rename or remove this definition.",
+          examples: const ["""
+class C {
+  void f() {}
+  int get f => 1;
+}
+
+main() {
+  new C();
+}
+
+"""]),
+
+      MessageKind.EXISTING_DEFINITION:
+        const MessageTemplate(MessageKind.EXISTING_DEFINITION,
+          "Existing definition of '#{name}'."),
+
+      MessageKind.DUPLICATE_IMPORT:
+        const MessageTemplate(MessageKind.DUPLICATE_IMPORT,
+          "Duplicate import of '#{name}'."),
+
+      MessageKind.HIDDEN_IMPORT:
+        const MessageTemplate(MessageKind.HIDDEN_IMPORT,
+          "'#{name}' from library '#{hiddenUri}' is hidden by '#{name}' "
+          "from library '#{hidingUri}'.",
+          howToFix:
+            "Try adding 'hide #{name}' to the import of '#{hiddenUri}'.",
+          examples: const [
+              const {
+'main.dart':
+"""
+import 'dart:async'; // This imports a class Future.
+import 'future.dart';
+
+void main() => new Future();""",
+
+'future.dart':
+"""
+library future;
+
+class Future {}"""},
+
+          const {
+'main.dart':
+"""
+import 'future.dart';
+import 'dart:async'; // This imports a class Future.
+
+void main() => new Future();""",
+
+'future.dart':
+"""
+library future;
+
+class Future {}"""},
+
+          const {
+'main.dart':
+"""
+import 'export.dart';
+import 'dart:async'; // This imports a class Future.
+
+void main() => new Future();""",
+
+'future.dart':
+"""
+library future;
+
+class Future {}""",
+
+'export.dart':
+"""
+library export;
+
+export 'future.dart';"""},
+
+         const {
+'main.dart':
+"""
+import 'future.dart' as prefix;
+import 'dart:async' as prefix; // This imports a class Future.
+
+void main() => new prefix.Future();""",
+
+'future.dart':
+"""
+library future;
+
+class Future {}"""}]),
+
+
+      MessageKind.HIDDEN_IMPLICIT_IMPORT:
+        const MessageTemplate(MessageKind.HIDDEN_IMPLICIT_IMPORT,
+          "'#{name}' from library '#{hiddenUri}' is hidden by '#{name}' "
+          "from library '#{hidingUri}'.",
+          howToFix: "Try adding an explicit "
+                    "'import \"#{hiddenUri}\" hide #{name}'.",
+          examples: const [
+              const {
+'main.dart':
+"""
+// This hides the implicit import of class Type from dart:core.
+import 'type.dart';
+
+void main() => new Type();""",
+
+'type.dart':
+"""
+library type;
+
+class Type {}"""},
+          const {
+'conflictsWithDart.dart':
+"""
+library conflictsWithDart;
+
+class Duration {
+  static var x = 100;
+}
+""",
+
+'conflictsWithDartAsWell.dart':
+"""
+library conflictsWithDartAsWell;
+
+class Duration {
+  static var x = 100;
+}
+""",
+
+'main.dart':
+r"""
+library testDartConflicts;
+
+import 'conflictsWithDart.dart';
+import 'conflictsWithDartAsWell.dart';
+
+main() {
+  print("Hail Caesar ${Duration.x}");
+}
+"""}]),
+
+      MessageKind.DUPLICATE_EXPORT:
+        const MessageTemplate(MessageKind.DUPLICATE_EXPORT,
+          "Duplicate export of '#{name}'.",
+          howToFix: "Try adding 'hide #{name}' to one of the exports.",
+          examples: const [const {
+'main.dart': """
+export 'decl1.dart';
+export 'decl2.dart';
+
+main() {}""",
+'decl1.dart': "class Class {}",
+'decl2.dart': "class Class {}"}]),
+
+      MessageKind.DUPLICATE_EXPORT_CONT:
+        const MessageTemplate(MessageKind.DUPLICATE_EXPORT_CONT,
+          "This is another export of '#{name}'."),
+
+      MessageKind.DUPLICATE_EXPORT_DECL:
+        const MessageTemplate(MessageKind.DUPLICATE_EXPORT_DECL,
+          "The exported '#{name}' from export #{uriString} is defined here."),
+
+      MessageKind.EMPTY_HIDE:
+        const MessageTemplate(MessageKind.EMPTY_HIDE,
+            "Library '#{uri}' doesn't export a '#{name}' declaration.",
+      howToFix: "Try removing '#{name}' the 'hide' clause.",
+      examples: const [
+        const {
+            'main.dart': """
+import 'dart:core' hide Foo;
+
+main() {}"""},
+        const {
+'main.dart': """
+export 'dart:core' hide Foo;
+
+main() {}"""},
+]),
+
+      MessageKind.EMPTY_SHOW:
+        const MessageTemplate(MessageKind.EMPTY_SHOW,
+            "Library '#{uri}' doesn't export a '#{name}' declaration.",
+      howToFix: "Try removing '#{name}' from the 'show' clause.",
+      examples: const [
+        const {
+            'main.dart': """
+import 'dart:core' show Foo;
+
+main() {}"""},
+        const {
+'main.dart': """
+export 'dart:core' show Foo;
+
+main() {}"""},
+]),
+
+      MessageKind.NOT_A_TYPE:
+        const MessageTemplate(MessageKind.NOT_A_TYPE,
+          "'#{node}' is not a type."),
+
+      MessageKind.NOT_A_PREFIX:
+        const MessageTemplate(MessageKind.NOT_A_PREFIX,
+          "'#{node}' is not a prefix."),
+
+      MessageKind.PREFIX_AS_EXPRESSION:
+        const MessageTemplate(MessageKind.PREFIX_AS_EXPRESSION,
+          "Library prefix '#{prefix}' is not a valid expression."),
+
+      MessageKind.CANNOT_FIND_CONSTRUCTOR:
+        const MessageTemplate(MessageKind.CANNOT_FIND_CONSTRUCTOR,
+          "Cannot find constructor '#{constructorName}' in class "
+          "'#{className}'."),
+
+      MessageKind.CANNOT_FIND_UNNAMED_CONSTRUCTOR:
+        const MessageTemplate(MessageKind.CANNOT_FIND_UNNAMED_CONSTRUCTOR,
+          "Cannot find unnamed constructor in class "
+          "'#{className}'."),
+
+      MessageKind.CYCLIC_CLASS_HIERARCHY:
+        const MessageTemplate(MessageKind.CYCLIC_CLASS_HIERARCHY,
+          "'#{className}' creates a cycle in the class hierarchy."),
+
+      MessageKind.CYCLIC_REDIRECTING_FACTORY:
+        const MessageTemplate(MessageKind.CYCLIC_REDIRECTING_FACTORY,
+          'Redirecting factory leads to a cyclic redirection.'),
+
+      MessageKind.INVALID_RECEIVER_IN_INITIALIZER:
+        const MessageTemplate(MessageKind.INVALID_RECEIVER_IN_INITIALIZER,
+          "Field initializer expected."),
+
+      MessageKind.NO_SUPER_IN_STATIC:
+        const MessageTemplate(MessageKind.NO_SUPER_IN_STATIC,
+          "'super' is only available in instance methods."),
+
+      MessageKind.DUPLICATE_INITIALIZER:
+        const MessageTemplate(MessageKind.DUPLICATE_INITIALIZER,
+          "Field '#{fieldName}' is initialized more than once."),
+
+      MessageKind.ALREADY_INITIALIZED:
+        const MessageTemplate(MessageKind.ALREADY_INITIALIZED,
+          "'#{fieldName}' was already initialized here."),
+
+      MessageKind.INIT_STATIC_FIELD:
+        const MessageTemplate(MessageKind.INIT_STATIC_FIELD,
+          "Cannot initialize static field '#{fieldName}'."),
+
+      MessageKind.NOT_A_FIELD:
+        const MessageTemplate(MessageKind.NOT_A_FIELD,
+          "'#{fieldName}' is not a field."),
+
+      MessageKind.CONSTRUCTOR_CALL_EXPECTED:
+        const MessageTemplate(MessageKind.CONSTRUCTOR_CALL_EXPECTED,
+          "only call to 'this' or 'super' constructor allowed."),
+
+      MessageKind.INVALID_FOR_IN:
+        const MessageTemplate(MessageKind.INVALID_FOR_IN,
+          "Invalid for-in variable declaration."),
+
+      MessageKind.INVALID_INITIALIZER:
+        const MessageTemplate(MessageKind.INVALID_INITIALIZER,
+          "Invalid initializer."),
+
+      MessageKind.FUNCTION_WITH_INITIALIZER:
+        const MessageTemplate(MessageKind.FUNCTION_WITH_INITIALIZER,
+          "Only constructors can have initializers."),
+
+      MessageKind.REDIRECTING_CONSTRUCTOR_CYCLE:
+        const MessageTemplate(MessageKind.REDIRECTING_CONSTRUCTOR_CYCLE,
+          "Cyclic constructor redirection."),
+
+      MessageKind.REDIRECTING_CONSTRUCTOR_HAS_BODY:
+        const MessageTemplate(MessageKind.REDIRECTING_CONSTRUCTOR_HAS_BODY,
+          "Redirecting constructor can't have a body."),
+
+      MessageKind.CONST_CONSTRUCTOR_HAS_BODY:
+        const MessageTemplate(MessageKind.CONST_CONSTRUCTOR_HAS_BODY,
+          "Const constructor or factory can't have a body.",
+          howToFix: "Remove the 'const' keyword or the body",
+          examples: const ["""
+class C {
+  const C() {}
+}
+
+main() => new C();"""]),
+
+      MessageKind.REDIRECTING_CONSTRUCTOR_HAS_INITIALIZER:
+        const MessageTemplate(
+          MessageKind.REDIRECTING_CONSTRUCTOR_HAS_INITIALIZER,
+          "Redirecting constructor cannot have other initializers."),
+
+      MessageKind.SUPER_INITIALIZER_IN_OBJECT:
+        const MessageTemplate(MessageKind.SUPER_INITIALIZER_IN_OBJECT,
+          "'Object' cannot have a super initializer."),
+
+      MessageKind.DUPLICATE_SUPER_INITIALIZER:
+        const MessageTemplate(MessageKind.DUPLICATE_SUPER_INITIALIZER,
+          "Cannot have more than one super initializer."),
+
+      MessageKind.SUPER_CALL_TO_FACTORY:
+        const MessageTemplate(MessageKind.SUPER_CALL_TO_FACTORY,
+          "The target of the superinitializer must be a generative "
+          "constructor.",
+          howToFix: "Try calling another constructor on the superclass.",
+          examples: const ["""
+class Super {
+  factory Super() => null;
+}
+class Class extends Super {}
+main() => new Class();
+""", """
+class Super {
+  factory Super() => null;
+}
+class Class extends Super {
+  Class();
+}
+main() => new Class();
+""", """
+class Super {
+  factory Super() => null;
+}
+class Class extends Super {
+  Class() : super();
+}
+main() => new Class();
+""", """
+class Super {
+  factory Super.foo() => null;
+}
+class Class extends Super {
+  Class() : super.foo();
+}
+main() => new Class();
+"""]),
+
+      MessageKind.THIS_CALL_TO_FACTORY:
+        const MessageTemplate(MessageKind.THIS_CALL_TO_FACTORY,
+          "The target of the redirection clause must be a generative "
+          "constructor",
+        howToFix: "Try redirecting to another constructor.",
+        examples: const ["""
+class Class {
+  factory Class() => null;
+  Class.foo() : this();
+}
+main() => new Class.foo();
+""", """
+class Class {
+  factory Class.foo() => null;
+  Class() : this.foo();
+}
+main() => new Class();
+"""]),
+
+      MessageKind.INVALID_CONSTRUCTOR_ARGUMENTS:
+        const MessageTemplate(MessageKind.INVALID_CONSTRUCTOR_ARGUMENTS,
+          "Arguments do not match the expected parameters of constructor "
+          "'#{constructorName}'."),
+
+      MessageKind.NO_MATCHING_CONSTRUCTOR:
+        const MessageTemplate(MessageKind.NO_MATCHING_CONSTRUCTOR,
+          "'super' call arguments and constructor parameters do not match."),
+
+      MessageKind.NO_MATCHING_CONSTRUCTOR_FOR_IMPLICIT:
+        const MessageTemplate(MessageKind.NO_MATCHING_CONSTRUCTOR_FOR_IMPLICIT,
+              "Implicit 'super' call arguments and constructor parameters "
+              "do not match."),
+
+      MessageKind.CONST_CALLS_NON_CONST:
+        const MessageTemplate(MessageKind.CONST_CALLS_NON_CONST,
+          "'const' constructor cannot call a non-const constructor."),
+
+      MessageKind.CONST_CALLS_NON_CONST_FOR_IMPLICIT:
+        const MessageTemplate(MessageKind.CONST_CALLS_NON_CONST_FOR_IMPLICIT,
+              "'const' constructor cannot call a non-const constructor. "
+              "This constructor has an implicit call to a "
+              "super non-const constructor.",
+              howToFix: "Try making the super constructor const.",
+              examples: const ["""
+class C {
+  C(); // missing const
+}
+class D extends C {
+  final d;
+  const D(this.d);
+}
+main() => new D(0);"""]),
+
+      MessageKind.CONST_CONSTRUCTOR_WITH_NONFINAL_FIELDS:
+        const MessageTemplate(
+          MessageKind.CONST_CONSTRUCTOR_WITH_NONFINAL_FIELDS,
+          "Can't declare constructor 'const' on class #{className} "
+          "because the class contains non-final instance fields.",
+          howToFix: "Try making all fields final.",
+          examples: const ["""
+class C {
+  // 'a' must be declared final to allow for the const constructor.
+  var a;
+  const C(this.a);
+}
+
+main() => new C(0);"""]),
+
+      MessageKind.CONST_CONSTRUCTOR_WITH_NONFINAL_FIELDS_FIELD:
+        const MessageTemplate(
+          MessageKind.CONST_CONSTRUCTOR_WITH_NONFINAL_FIELDS_FIELD,
+          "This non-final field prevents using const constructors."),
+
+      MessageKind.CONST_CONSTRUCTOR_WITH_NONFINAL_FIELDS_CONSTRUCTOR:
+        const MessageTemplate(
+          MessageKind.CONST_CONSTRUCTOR_WITH_NONFINAL_FIELDS_CONSTRUCTOR,
+          "This const constructor is not allowed due to "
+          "non-final fields."),
+
+
+      MessageKind.INITIALIZING_FORMAL_NOT_ALLOWED:
+        const MessageTemplate(MessageKind.INITIALIZING_FORMAL_NOT_ALLOWED,
+          "Initializing formal parameter only allowed in generative "
+          "constructor."),
+
+      MessageKind.INVALID_PARAMETER:
+        const MessageTemplate(MessageKind.INVALID_PARAMETER,
+          "Cannot resolve parameter."),
+
+      MessageKind.NOT_INSTANCE_FIELD:
+        const MessageTemplate(MessageKind.NOT_INSTANCE_FIELD,
+          "'#{fieldName}' is not an instance field."),
+
+      MessageKind.THIS_PROPERTY:
+        const MessageTemplate(MessageKind.THIS_PROPERTY,
+          "Expected an identifier."),
+
+      MessageKind.NO_CATCH_NOR_FINALLY:
+        const MessageTemplate(MessageKind.NO_CATCH_NOR_FINALLY,
+          "Expected 'catch' or 'finally'."),
+
+      MessageKind.EMPTY_CATCH_DECLARATION:
+        const MessageTemplate(MessageKind.EMPTY_CATCH_DECLARATION,
+          "Expected an identifier in catch declaration."),
+
+      MessageKind.EXTRA_CATCH_DECLARATION:
+        const MessageTemplate(MessageKind.EXTRA_CATCH_DECLARATION,
+          "Extra parameter in catch declaration."),
+
+      MessageKind.PARAMETER_WITH_TYPE_IN_CATCH:
+        const MessageTemplate(MessageKind.PARAMETER_WITH_TYPE_IN_CATCH,
+          "Cannot use type annotations in catch."),
+
+      MessageKind.PARAMETER_WITH_MODIFIER_IN_CATCH:
+        const MessageTemplate(MessageKind.PARAMETER_WITH_MODIFIER_IN_CATCH,
+          "Cannot use modifiers in catch."),
+
+      MessageKind.OPTIONAL_PARAMETER_IN_CATCH:
+        const MessageTemplate(MessageKind.OPTIONAL_PARAMETER_IN_CATCH,
+          "Cannot use optional parameters in catch."),
+
+      MessageKind.THROW_WITHOUT_EXPRESSION:
+        const MessageTemplate(MessageKind.THROW_WITHOUT_EXPRESSION,
+          "Cannot use re-throw outside of catch block "
+          "(expression expected after 'throw')."),
+
+      MessageKind.UNBOUND_LABEL:
+        const MessageTemplate(MessageKind.UNBOUND_LABEL,
+          "Cannot resolve label '#{labelName}'."),
+
+      MessageKind.NO_BREAK_TARGET:
+        const MessageTemplate(MessageKind.NO_BREAK_TARGET,
+          "'break' statement not inside switch or loop."),
+
+      MessageKind.NO_CONTINUE_TARGET:
+        const MessageTemplate(MessageKind.NO_CONTINUE_TARGET,
+          "'continue' statement not inside loop."),
+
+      MessageKind.EXISTING_LABEL:
+        const MessageTemplate(MessageKind.EXISTING_LABEL,
+          "Original declaration of duplicate label '#{labelName}'."),
+
+      MessageKind.DUPLICATE_LABEL:
+        const MessageTemplate(MessageKind.DUPLICATE_LABEL,
+          "Duplicate declaration of label '#{labelName}'."),
+
+      MessageKind.UNUSED_LABEL:
+        const MessageTemplate(MessageKind.UNUSED_LABEL,
+          "Unused label '#{labelName}'."),
+
+      MessageKind.INVALID_CONTINUE:
+        const MessageTemplate(MessageKind.INVALID_CONTINUE,
+          "Target of continue is not a loop or switch case."),
+
+      MessageKind.INVALID_BREAK:
+        const MessageTemplate(MessageKind.INVALID_BREAK,
+          "Target of break is not a statement."),
+
+      MessageKind.DUPLICATE_TYPE_VARIABLE_NAME:
+        const MessageTemplate(MessageKind.DUPLICATE_TYPE_VARIABLE_NAME,
+          "Type variable '#{typeVariableName}' already declared."),
+
+      MessageKind.TYPE_VARIABLE_WITHIN_STATIC_MEMBER:
+        const MessageTemplate(MessageKind.TYPE_VARIABLE_WITHIN_STATIC_MEMBER,
+              "Cannot refer to type variable '#{typeVariableName}' "
+              "within a static member."),
+
+      MessageKind.TYPE_VARIABLE_IN_CONSTANT:
+        const MessageTemplate(MessageKind.TYPE_VARIABLE_IN_CONSTANT,
+          "Constant expressions can't refer to type variables.",
+          howToFix: "Try removing the type variable or replacing it with a "
+                    "concrete type.",
+          examples: const ["""
+class C<T> {
+  const C();
+
+  m(T t) => const C<T>();
+}
+
+void main() => new C().m(null);
+"""
+]),
+
+      MessageKind.INVALID_TYPE_VARIABLE_BOUND:
+        const MessageTemplate(MessageKind.INVALID_TYPE_VARIABLE_BOUND,
+          "'#{typeArgument}' is not a subtype of bound '#{bound}' for "
+          "type variable '#{typeVariable}' of type '#{thisType}'.",
+          howToFix: "Try to change or remove the type argument.",
+          examples: const ["""
+class C<T extends num> {}
+
+// 'String' is not a valid instantiation of T with bound num.'.
+main() => new C<String>();
+"""]),
+
+      MessageKind.INVALID_USE_OF_SUPER:
+        const MessageTemplate(MessageKind.INVALID_USE_OF_SUPER,
+          "'super' not allowed here."),
+
+      MessageKind.INVALID_CASE_DEFAULT:
+        const MessageTemplate(MessageKind.INVALID_CASE_DEFAULT,
+          "'default' only allowed on last case of a switch."),
+
+      MessageKind.SWITCH_CASE_TYPES_NOT_EQUAL:
+        const MessageTemplate(MessageKind.SWITCH_CASE_TYPES_NOT_EQUAL,
+          "'case' expressions do not all have type '#{type}'."),
+
+      MessageKind.SWITCH_CASE_TYPES_NOT_EQUAL_CASE:
+        const MessageTemplate(MessageKind.SWITCH_CASE_TYPES_NOT_EQUAL_CASE,
+          "'case' expression of type '#{type}'."),
+
+      MessageKind.SWITCH_CASE_FORBIDDEN:
+        const MessageTemplate(MessageKind.SWITCH_CASE_FORBIDDEN,
+          "'case' expression may not be of type '#{type}'."),
+
+      MessageKind.SWITCH_CASE_VALUE_OVERRIDES_EQUALS:
+        const MessageTemplate(MessageKind.SWITCH_CASE_VALUE_OVERRIDES_EQUALS,
+              "'case' expression type '#{type}' overrides 'operator =='."),
+
+      MessageKind.INVALID_ARGUMENT_AFTER_NAMED:
+        const MessageTemplate(MessageKind.INVALID_ARGUMENT_AFTER_NAMED,
+          "Unnamed argument after named argument."),
+
+      MessageKind.INVALID_AWAIT_FOR_IN:
+        const MessageTemplate(MessageKind.INVALID_AWAIT_FOR_IN,
+          "'await' is only supported in methods with an 'async' or "
+              "'async*' body modifier.",
+          howToFix: "Try adding 'async' or 'async*' to the method body or "
+              "removing the 'await' keyword.",
+          examples: const [
+            """
+main(o) sync* {
+  await for (var e in o) {}
+}"""]),
+
+      MessageKind.INVALID_AWAIT:
+        const MessageTemplate(MessageKind.INVALID_AWAIT,
+          "'await' is only supported in methods with an 'async' or "
+              "'async*' body modifier.",
+          howToFix: "Try adding 'async' or 'async*' to the method body.",
+          examples: const [
+          """
+main(o) sync* {
+  await null;
+}"""]),
+
+      MessageKind.INVALID_YIELD:
+        const MessageTemplate(MessageKind.INVALID_YIELD,
+          "'yield' is only supported in methods with a 'sync*' or "
+              "'async*' body modifier.",
+          howToFix: "Try adding 'sync*' or 'async*' to the method body.",
+          examples: const [
+            """
+main(o) async {
+  yield 0;
+}"""]),
+
+      MessageKind.NOT_A_COMPILE_TIME_CONSTANT:
+        const MessageTemplate(MessageKind.NOT_A_COMPILE_TIME_CONSTANT,
+          "Not a compile-time constant."),
+
+      MessageKind.DEFERRED_COMPILE_TIME_CONSTANT:
+        const MessageTemplate(MessageKind.DEFERRED_COMPILE_TIME_CONSTANT,
+          "A deferred value cannot be used as a compile-time constant."),
+
+      MessageKind.DEFERRED_COMPILE_TIME_CONSTANT_CONSTRUCTION:
+        const MessageTemplate(
+          MessageKind.DEFERRED_COMPILE_TIME_CONSTANT_CONSTRUCTION,
+          "A deferred class cannot be used to create a "
+          "compile-time constant."),
+
+      MessageKind.CYCLIC_COMPILE_TIME_CONSTANTS:
+        const MessageTemplate(MessageKind.CYCLIC_COMPILE_TIME_CONSTANTS,
+          "Cycle in the compile-time constant computation."),
+
+      MessageKind.CONSTRUCTOR_IS_NOT_CONST:
+        const MessageTemplate(MessageKind.CONSTRUCTOR_IS_NOT_CONST,
+          "Constructor is not a 'const' constructor."),
+
+      MessageKind.CONST_MAP_KEY_OVERRIDES_EQUALS:
+        const MessageTemplate(MessageKind.CONST_MAP_KEY_OVERRIDES_EQUALS,
+              "Const-map key type '#{type}' overrides 'operator =='."),
+
+      MessageKind.NO_SUCH_LIBRARY_MEMBER:
+        const MessageTemplate(MessageKind.NO_SUCH_LIBRARY_MEMBER,
+          "'#{libraryName}' has no member named '#{memberName}'."),
+
+      MessageKind.CANNOT_INSTANTIATE_TYPEDEF:
+        const MessageTemplate(MessageKind.CANNOT_INSTANTIATE_TYPEDEF,
+          "Cannot instantiate typedef '#{typedefName}'."),
+
+      MessageKind.REQUIRED_PARAMETER_WITH_DEFAULT:
+        const MessageTemplate(MessageKind.REQUIRED_PARAMETER_WITH_DEFAULT,
+          "Non-optional parameters can't have a default value.",
+          howToFix:
+            "Try removing the default value or making the parameter optional.",
+          examples: const ["""
+main() {
+  foo(a: 1) => print(a);
+  foo(2);
+}""", """
+main() {
+  foo(a = 1) => print(a);
+  foo(2);
+}"""]),
+
+      MessageKind.NAMED_PARAMETER_WITH_EQUALS:
+        const MessageTemplate(MessageKind.NAMED_PARAMETER_WITH_EQUALS,
+          "Named optional parameters can't use '=' to specify a default "
+          "value.",
+          howToFix: "Try replacing '=' with ':'.",
+          examples: const ["""
+main() {
+  foo({a = 1}) => print(a);
+  foo(a: 2);
+}"""]),
+
+      MessageKind.POSITIONAL_PARAMETER_WITH_EQUALS:
+        const MessageTemplate(MessageKind.POSITIONAL_PARAMETER_WITH_EQUALS,
+          "Positional optional parameters can't use ':' to specify a "
+          "default value.",
+          howToFix: "Try replacing ':' with '='.",
+          examples: const ["""
+main() {
+  foo([a: 1]) => print(a);
+  foo(2);
+}"""]),
+
+      MessageKind.TYPEDEF_FORMAL_WITH_DEFAULT:
+        const MessageTemplate(MessageKind.TYPEDEF_FORMAL_WITH_DEFAULT,
+          "A parameter of a typedef can't specify a default value.",
+          howToFix:
+            "Try removing the default value.",
+          examples: const ["""
+typedef void F([int arg = 0]);
+
+main() {
+  F f;
+}""", """
+typedef void F({int arg: 0});
+
+main() {
+  F f;
+}"""]),
+
+      MessageKind.FUNCTION_TYPE_FORMAL_WITH_DEFAULT:
+        const MessageTemplate(MessageKind.FUNCTION_TYPE_FORMAL_WITH_DEFAULT,
+          "A function type parameter can't specify a default value.",
+          howToFix:
+            "Try removing the default value.",
+          examples: const ["""
+foo(f(int i, [a = 1])) {}
+
+main() {
+  foo(1, 2);
+}""", """
+foo(f(int i, {a: 1})) {}
+
+main() {
+  foo(1, a: 2);
+}"""]),
+
+      MessageKind.REDIRECTING_FACTORY_WITH_DEFAULT:
+        const MessageTemplate(MessageKind.REDIRECTING_FACTORY_WITH_DEFAULT,
+          "A parameter of a redirecting factory constructor can't specify a "
+          "default value.",
+          howToFix:
+            "Try removing the default value.",
+          examples: const ["""
+class A {
+  A([a]);
+  factory A.foo([a = 1]) = A;
+}
+
+main() {
+  new A.foo(1);
+}""", """
+class A {
+  A({a});
+  factory A.foo({a: 1}) = A;
+}
+
+main() {
+  new A.foo(a: 1);
+}"""]),
+
+      MessageKind.FORMAL_DECLARED_CONST:
+        const MessageTemplate(MessageKind.FORMAL_DECLARED_CONST,
+          "A formal parameter can't be declared const.",
+          howToFix: "Try removing 'const'.",
+          examples: const ["""
+foo(const x) {}
+main() => foo(42);
+""", """
+foo({const x}) {}
+main() => foo(42);
+""", """
+foo([const x]) {}
+main() => foo(42);
+"""]),
+
+      MessageKind.FORMAL_DECLARED_STATIC:
+        const MessageTemplate(MessageKind.FORMAL_DECLARED_STATIC,
+          "A formal parameter can't be declared static.",
+          howToFix: "Try removing 'static'.",
+          examples: const ["""
+foo(static x) {}
+main() => foo(42);
+""", """
+foo({static x}) {}
+main() => foo(42);
+""", """
+foo([static x]) {}
+main() => foo(42);
+"""]),
+
+      MessageKind.FINAL_FUNCTION_TYPE_PARAMETER:
+        const MessageTemplate(MessageKind.FINAL_FUNCTION_TYPE_PARAMETER,
+          "A function type parameter can't be declared final.",
+          howToFix: "Try removing 'final'.",
+          examples: const ["""
+foo(final int x(int a)) {}
+main() => foo((y) => 42);
+""", """
+foo({final int x(int a)}) {}
+main() => foo((y) => 42);
+""", """
+foo([final int x(int a)]) {}
+main() => foo((y) => 42);
+"""]),
+
+      MessageKind.VAR_FUNCTION_TYPE_PARAMETER:
+        const MessageTemplate(MessageKind.VAR_FUNCTION_TYPE_PARAMETER,
+          "A function type parameter can't be declared with 'var'.",
+          howToFix: "Try removing 'var'.",
+          examples: const ["""
+foo(var int x(int a)) {}
+main() => foo((y) => 42);
+""", """
+foo({var int x(int a)}) {}
+main() => foo((y) => 42);
+""", """
+foo([var int x(int a)]) {}
+main() => foo((y) => 42);
+"""]),
+
+      MessageKind.CANNOT_INSTANTIATE_TYPE_VARIABLE:
+        const MessageTemplate(MessageKind.CANNOT_INSTANTIATE_TYPE_VARIABLE,
+          "Cannot instantiate type variable '#{typeVariableName}'."),
+
+      MessageKind.CYCLIC_TYPE_VARIABLE:
+        const MessageTemplate(MessageKind.CYCLIC_TYPE_VARIABLE,
+          "Type variable '#{typeVariableName}' is a supertype of itself."),
+
+      MessageKind.CYCLIC_TYPEDEF:
+        const MessageTemplate(MessageKind.CYCLIC_TYPEDEF,
+          "A typedef can't refer to itself.",
+          howToFix: "Try removing all references to '#{typedefName}' "
+                    "in the definition of '#{typedefName}'.",
+          examples: const ["""
+typedef F F(); // The return type 'F' is a self-reference.
+main() { F f = null; }"""]),
+
+      MessageKind.CYCLIC_TYPEDEF_ONE:
+        const MessageTemplate(MessageKind.CYCLIC_TYPEDEF_ONE,
+          "A typedef can't refer to itself through another typedef.",
+          howToFix:
+            "Try removing all references to "
+            "'#{otherTypedefName}' in the definition of '#{typedefName}'.",
+          examples: const ["""
+typedef G F(); // The return type 'G' is a self-reference through typedef 'G'.
+typedef F G(); // The return type 'F' is a self-reference through typedef 'F'.
+main() { F f = null; }""",
+"""
+typedef G F(); // The return type 'G' creates a self-reference.
+typedef H G(); // The return type 'H' creates a self-reference.
+typedef H(F f); // The argument type 'F' creates a self-reference.
+main() { F f = null; }"""]),
+
+      MessageKind.CLASS_NAME_EXPECTED:
+        const MessageTemplate(MessageKind.CLASS_NAME_EXPECTED,
+          "Class name expected."),
+
+      MessageKind.CANNOT_EXTEND:
+        const MessageTemplate(MessageKind.CANNOT_EXTEND,
+          "'#{type}' cannot be extended."),
+
+      MessageKind.CANNOT_IMPLEMENT:
+        const MessageTemplate(MessageKind.CANNOT_IMPLEMENT,
+          "'#{type}' cannot be implemented."),
+
+      // TODO(johnnwinther): Split messages into reasons for malformedness.
+      MessageKind.CANNOT_EXTEND_MALFORMED:
+        const MessageTemplate(MessageKind.CANNOT_EXTEND_MALFORMED,
+          "Class '#{className}' can't extend the type '#{malformedType}' "
+          "because it is malformed.",
+          howToFix:
+            "Try correcting the malformed type annotation or removing the "
+            "'extends' clause.",
+          examples: const ["""
+class A extends Malformed {}
+main() => new A();"""]),
+
+      MessageKind.CANNOT_IMPLEMENT_MALFORMED:
+        const MessageTemplate(MessageKind.CANNOT_IMPLEMENT_MALFORMED,
+          "Class '#{className}' can't implement the type '#{malformedType}' "
+          "because it is malformed.",
+          howToFix:
+            "Try correcting the malformed type annotation or removing the "
+            "type from the 'implements' clause.",
+          examples: const ["""
+class A implements Malformed {}
+main() => new A();"""]),
+
+      MessageKind.CANNOT_MIXIN_MALFORMED:
+        const MessageTemplate(MessageKind.CANNOT_MIXIN_MALFORMED,
+          "Class '#{className}' can't mixin the type '#{malformedType}' "
+          "because it is malformed.",
+          howToFix:
+            "Try correcting the malformed type annotation or removing the "
+            "type from the 'with' clause.",
+          examples: const ["""
+class A extends Object with Malformed {}
+main() => new A();"""]),
+
+      MessageKind.CANNOT_MIXIN:
+        const MessageTemplate(MessageKind.CANNOT_MIXIN,
+          "The type '#{type}' can't be mixed in.",
+          howToFix: "Try removing '#{type}' from the 'with' clause.",
+          examples: const ["""
+class C extends Object with String {}
+
+main() => new C();
+""", """
+typedef C = Object with String;
+
+main() => new C();
+"""]),
+
+      MessageKind.CANNOT_EXTEND_ENUM:
+        const MessageTemplate(MessageKind.CANNOT_EXTEND_ENUM,
+          "Class '#{className}' can't extend the type '#{enumType}' because "
+          "it is declared by an enum.",
+          howToFix: "Try making '#{enumType}' a normal class or removing the "
+            "'extends' clause.",
+          examples: const ["""
+enum Enum { A }
+class B extends Enum {}
+main() => new B();"""]),
+
+      MessageKind.CANNOT_IMPLEMENT_ENUM:
+        const MessageTemplate(MessageKind.CANNOT_IMPLEMENT_ENUM,
+          "Class '#{className}' can't implement the type '#{enumType}' "
+          "because it is declared by an enum.",
+          howToFix: "Try making '#{enumType}' a normal class or removing the "
+            "type from the 'implements' clause.",
+          examples: const ["""
+enum Enum { A }
+class B implements Enum {}
+main() => new B();"""]),
+
+      MessageKind.CANNOT_MIXIN_ENUM:
+        const MessageTemplate(MessageKind.CANNOT_MIXIN_ENUM,
+          "Class '#{className}' can't mixin the type '#{enumType}' because it "
+          "is declared by an enum.",
+          howToFix: "Try making '#{enumType}' a normal class or removing the "
+            "type from the 'with' clause.",
+          examples: const ["""
+enum Enum { A }
+class B extends Object with Enum {}
+main() => new B();"""]),
+
+      MessageKind.CANNOT_INSTANTIATE_ENUM:
+        const MessageTemplate(MessageKind.CANNOT_INSTANTIATE_ENUM,
+          "Enum type '#{enumName}' cannot be instantiated.",
+          howToFix: "Try making '#{enumType}' a normal class or use an enum "
+                    "constant.",
+          examples: const ["""
+enum Enum { A }
+main() => new Enum(0);""", """
+enum Enum { A }
+main() => const Enum(0);"""]),
+
+      MessageKind.EMPTY_ENUM_DECLARATION:
+        const MessageTemplate(MessageKind.EMPTY_ENUM_DECLARATION,
+          "Enum '#{enumName}' must contain at least one value.",
+          howToFix: "Try adding an enum constant or making #{enumName} a "
+                    "normal class.",
+          examples: const ["""
+enum Enum {}
+main() { Enum e; }"""]),
+
+      MessageKind.MISSING_ENUM_CASES:
+        const MessageTemplate(MessageKind.MISSING_ENUM_CASES,
+          "Missing enum constants in switch statement: #{enumValues}.",
+          howToFix: "Try adding the missing constants or a default case.",
+          examples: const ["""
+enum Enum { A, B }
+main() {
+  switch (Enum.A) {
+  case Enum.B: break;
+  }
+}""", """
+enum Enum { A, B, C }
+main() {
+  switch (Enum.A) {
+  case Enum.B: break;
+  }
+}"""]),
+
+      MessageKind.DUPLICATE_EXTENDS_IMPLEMENTS:
+        const MessageTemplate(MessageKind.DUPLICATE_EXTENDS_IMPLEMENTS,
+          "'#{type}' can not be both extended and implemented."),
+
+      MessageKind.DUPLICATE_IMPLEMENTS:
+        const MessageTemplate(MessageKind.DUPLICATE_IMPLEMENTS,
+          "'#{type}' must not occur more than once "
+          "in the implements clause."),
+
+      MessageKind.MULTI_INHERITANCE:
+        const MessageTemplate(MessageKind.MULTI_INHERITANCE,
+          "Dart2js does not currently support inheritance of the same class "
+          "with different type arguments: Both #{firstType} and #{secondType} "
+          "are supertypes of #{thisType}."),
+
+      MessageKind.ILLEGAL_SUPER_SEND:
+        const MessageTemplate(MessageKind.ILLEGAL_SUPER_SEND,
+          "'#{name}' cannot be called on super."),
+
+      MessageKind.NO_SUCH_SUPER_MEMBER:
+        const MessageTemplate(MessageKind.NO_SUCH_SUPER_MEMBER,
+          "Cannot resolve '#{memberName}' in a superclass of '#{className}'."),
+
+      MessageKind.ADDITIONAL_TYPE_ARGUMENT:
+        const MessageTemplate(MessageKind.ADDITIONAL_TYPE_ARGUMENT,
+          "Additional type argument."),
+
+      MessageKind.MISSING_TYPE_ARGUMENT:
+        const MessageTemplate(MessageKind.MISSING_TYPE_ARGUMENT,
+          "Missing type argument."),
+
+      // TODO(johnniwinther): Use ADDITIONAL_TYPE_ARGUMENT or
+      // MISSING_TYPE_ARGUMENT instead.
+      MessageKind.TYPE_ARGUMENT_COUNT_MISMATCH:
+        const MessageTemplate(MessageKind.TYPE_ARGUMENT_COUNT_MISMATCH,
+          "Incorrect number of type arguments on '#{type}'."),
+
+      MessageKind.GETTER_MISMATCH:
+        const MessageTemplate(MessageKind.GETTER_MISMATCH,
+          "Setter disagrees on: '#{modifiers}'."),
+
+      MessageKind.SETTER_MISMATCH:
+        const MessageTemplate(MessageKind.SETTER_MISMATCH,
+          "Getter disagrees on: '#{modifiers}'."),
+
+      MessageKind.ILLEGAL_SETTER_FORMALS:
+        const MessageTemplate(MessageKind.ILLEGAL_SETTER_FORMALS,
+          "A setter must have exactly one argument."),
+
+      MessageKind.NO_STATIC_OVERRIDE:
+        const MessageTemplate(MessageKind.NO_STATIC_OVERRIDE,
+          "Static member cannot override instance member '#{memberName}' of "
+          "'#{className}'."),
+
+      MessageKind.NO_STATIC_OVERRIDE_CONT:
+        const MessageTemplate(MessageKind.NO_STATIC_OVERRIDE_CONT,
+          "This is the instance member that cannot be overridden "
+          "by a static member."),
+
+      MessageKind.INSTANCE_STATIC_SAME_NAME:
+        const MessageTemplate(MessageKind.INSTANCE_STATIC_SAME_NAME,
+          "Instance member '#{memberName}' and static member of "
+          "superclass '#{className}' have the same name."),
+
+      MessageKind.INSTANCE_STATIC_SAME_NAME_CONT:
+        const MessageTemplate(MessageKind.INSTANCE_STATIC_SAME_NAME_CONT,
+          "This is the static member with the same name."),
+
+      MessageKind.INVALID_OVERRIDE_METHOD:
+        const MessageTemplate(MessageKind.INVALID_OVERRIDE_METHOD,
+          "The type '#{declaredType}' of method '#{name}' declared in "
+          "'#{class}' is not a subtype of the overridden method type "
+          "'#{inheritedType}' inherited from '#{inheritedClass}'."),
+
+      MessageKind.INVALID_OVERRIDDEN_METHOD:
+        const MessageTemplate(MessageKind.INVALID_OVERRIDDEN_METHOD,
+          "This is the overridden method '#{name}' declared in class "
+          "'#{class}'."),
+
+      MessageKind.INVALID_OVERRIDE_GETTER:
+        const MessageTemplate(MessageKind.INVALID_OVERRIDE_GETTER,
+          "The type '#{declaredType}' of getter '#{name}' declared in "
+          "'#{class}' is not assignable to the type '#{inheritedType}' of the "
+          "overridden getter inherited from '#{inheritedClass}'."),
+
+      MessageKind.INVALID_OVERRIDDEN_GETTER:
+        const MessageTemplate(MessageKind.INVALID_OVERRIDDEN_GETTER,
+          "This is the overridden getter '#{name}' declared in class "
+          "'#{class}'."),
+
+      MessageKind.INVALID_OVERRIDE_GETTER_WITH_FIELD:
+        const MessageTemplate(MessageKind.INVALID_OVERRIDE_GETTER_WITH_FIELD,
+          "The type '#{declaredType}' of field '#{name}' declared in "
+          "'#{class}' is not assignable to the type '#{inheritedType}' of the "
+          "overridden getter inherited from '#{inheritedClass}'."),
+
+      MessageKind.INVALID_OVERRIDE_FIELD_WITH_GETTER:
+        const MessageTemplate(MessageKind.INVALID_OVERRIDE_FIELD_WITH_GETTER,
+          "The type '#{declaredType}' of getter '#{name}' declared in "
+          "'#{class}' is not assignable to the type '#{inheritedType}' of the "
+          "overridden field inherited from '#{inheritedClass}'."),
+
+      MessageKind.INVALID_OVERRIDE_SETTER:
+        const MessageTemplate(MessageKind.INVALID_OVERRIDE_SETTER,
+          "The type '#{declaredType}' of setter '#{name}' declared in "
+          "'#{class}' is not assignable to the type '#{inheritedType}' of the "
+          "overridden setter inherited from '#{inheritedClass}'."),
+
+      MessageKind.INVALID_OVERRIDDEN_SETTER:
+        const MessageTemplate(MessageKind.INVALID_OVERRIDDEN_SETTER,
+          "This is the overridden setter '#{name}' declared in class "
+          "'#{class}'."),
+
+      MessageKind.INVALID_OVERRIDE_SETTER_WITH_FIELD:
+        const MessageTemplate(MessageKind.INVALID_OVERRIDE_SETTER_WITH_FIELD,
+          "The type '#{declaredType}' of field '#{name}' declared in "
+          "'#{class}' is not assignable to the type '#{inheritedType}' of the "
+          "overridden setter inherited from '#{inheritedClass}'."),
+
+      MessageKind.INVALID_OVERRIDE_FIELD_WITH_SETTER:
+        const MessageTemplate(MessageKind.INVALID_OVERRIDE_FIELD_WITH_SETTER,
+          "The type '#{declaredType}' of setter '#{name}' declared in "
+          "'#{class}' is not assignable to the type '#{inheritedType}' of the "
+          "overridden field inherited from '#{inheritedClass}'."),
+
+      MessageKind.INVALID_OVERRIDE_FIELD:
+        const MessageTemplate(MessageKind.INVALID_OVERRIDE_FIELD,
+          "The type '#{declaredType}' of field '#{name}' declared in "
+          "'#{class}' is not assignable to the type '#{inheritedType}' of the "
+          "overridden field inherited from '#{inheritedClass}'."),
+
+      MessageKind.INVALID_OVERRIDDEN_FIELD:
+        const MessageTemplate(MessageKind.INVALID_OVERRIDDEN_FIELD,
+          "This is the overridden field '#{name}' declared in class "
+          "'#{class}'."),
+
+      MessageKind.CANNOT_OVERRIDE_FIELD_WITH_METHOD:
+        const MessageTemplate(MessageKind.CANNOT_OVERRIDE_FIELD_WITH_METHOD,
+          "Method '#{name}' in '#{class}' can't override field from "
+          "'#{inheritedClass}'."),
+
+      MessageKind.CANNOT_OVERRIDE_FIELD_WITH_METHOD_CONT:
+        const MessageTemplate(
+          MessageKind.CANNOT_OVERRIDE_FIELD_WITH_METHOD_CONT,
+          "This is the field that cannot be overridden by a method."),
+
+      MessageKind.CANNOT_OVERRIDE_METHOD_WITH_FIELD:
+        const MessageTemplate(
+          MessageKind.CANNOT_OVERRIDE_METHOD_WITH_FIELD,
+          "Field '#{name}' in '#{class}' can't override method from "
+          "'#{inheritedClass}'."),
+
+      MessageKind.CANNOT_OVERRIDE_METHOD_WITH_FIELD_CONT:
+        const MessageTemplate(
+          MessageKind.CANNOT_OVERRIDE_METHOD_WITH_FIELD_CONT,
+          "This is the method that cannot be overridden by a field."),
+
+      MessageKind.CANNOT_OVERRIDE_GETTER_WITH_METHOD:
+        const MessageTemplate(MessageKind.CANNOT_OVERRIDE_GETTER_WITH_METHOD,
+              "Method '#{name}' in '#{class}' can't override getter from "
+              "'#{inheritedClass}'."),
+
+      MessageKind.CANNOT_OVERRIDE_GETTER_WITH_METHOD_CONT:
+        const MessageTemplate(
+          MessageKind.CANNOT_OVERRIDE_GETTER_WITH_METHOD_CONT,
+          "This is the getter that cannot be overridden by a method."),
+
+      MessageKind.CANNOT_OVERRIDE_METHOD_WITH_GETTER:
+        const MessageTemplate(MessageKind.CANNOT_OVERRIDE_METHOD_WITH_GETTER,
+          "Getter '#{name}' in '#{class}' can't override method from "
+          "'#{inheritedClass}'."),
+
+      MessageKind.CANNOT_OVERRIDE_METHOD_WITH_GETTER_CONT:
+        const MessageTemplate(
+          MessageKind.CANNOT_OVERRIDE_METHOD_WITH_GETTER_CONT,
+          "This is the method that cannot be overridden by a getter."),
+
+      MessageKind.MISSING_FORMALS:
+        const MessageTemplate(MessageKind.MISSING_FORMALS,
+          "Formal parameters are missing."),
+
+      MessageKind.EXTRA_FORMALS:
+        const MessageTemplate(MessageKind.EXTRA_FORMALS,
+          "Formal parameters are not allowed here."),
+
+      MessageKind.UNARY_OPERATOR_BAD_ARITY:
+        const MessageTemplate(MessageKind.UNARY_OPERATOR_BAD_ARITY,
+          "Operator '#{operatorName}' must have no parameters."),
+
+      MessageKind.MINUS_OPERATOR_BAD_ARITY:
+        const MessageTemplate(MessageKind.MINUS_OPERATOR_BAD_ARITY,
+          "Operator '-' must have 0 or 1 parameters."),
+
+      MessageKind.BINARY_OPERATOR_BAD_ARITY:
+        const MessageTemplate(MessageKind.BINARY_OPERATOR_BAD_ARITY,
+          "Operator '#{operatorName}' must have exactly 1 parameter."),
+
+      MessageKind.TERNARY_OPERATOR_BAD_ARITY:
+        const MessageTemplate(MessageKind.TERNARY_OPERATOR_BAD_ARITY,
+          "Operator '#{operatorName}' must have exactly 2 parameters."),
+
+      MessageKind.OPERATOR_OPTIONAL_PARAMETERS:
+        const MessageTemplate(MessageKind.OPERATOR_OPTIONAL_PARAMETERS,
+          "Operator '#{operatorName}' cannot have optional parameters."),
+
+      MessageKind.OPERATOR_NAMED_PARAMETERS:
+        const MessageTemplate(MessageKind.OPERATOR_NAMED_PARAMETERS,
+          "Operator '#{operatorName}' cannot have named parameters."),
+
+      MessageKind.CONSTRUCTOR_WITH_RETURN_TYPE:
+        const MessageTemplate(MessageKind.CONSTRUCTOR_WITH_RETURN_TYPE,
+          "Cannot have return type for constructor."),
+
+      MessageKind.CANNOT_RETURN_FROM_CONSTRUCTOR:
+        const MessageTemplate(MessageKind.CANNOT_RETURN_FROM_CONSTRUCTOR,
+          "Constructors can't return values.",
+          howToFix: "Remove the return statement or use a factory constructor.",
+          examples: const ["""
+class C {
+  C() {
+    return 1;
+  }
+}
+
+main() => new C();"""]),
+
+      MessageKind.ILLEGAL_FINAL_METHOD_MODIFIER:
+        const MessageTemplate(MessageKind.ILLEGAL_FINAL_METHOD_MODIFIER,
+          "Cannot have final modifier on method."),
+
+      MessageKind.ILLEGAL_CONST_FIELD_MODIFIER:
+        const MessageTemplate(MessageKind.ILLEGAL_CONST_FIELD_MODIFIER,
+          "Cannot have const modifier on non-static field.",
+          howToFix:
+            "Try adding a static modifier, or removing the const modifier.",
+          examples: const ["""
+class C {
+  const int a = 1;
+}
+
+main() => new C();"""]),
+
+      MessageKind.ILLEGAL_CONSTRUCTOR_MODIFIERS:
+        const MessageTemplate(MessageKind.ILLEGAL_CONSTRUCTOR_MODIFIERS,
+          "Illegal constructor modifiers: '#{modifiers}'."),
+
+      MessageKind.ILLEGAL_MIXIN_APPLICATION_MODIFIERS:
+        const MessageTemplate(MessageKind.ILLEGAL_MIXIN_APPLICATION_MODIFIERS,
+              "Illegal mixin application modifiers: '#{modifiers}'."),
+
+      MessageKind.ILLEGAL_MIXIN_SUPERCLASS:
+        const MessageTemplate(MessageKind.ILLEGAL_MIXIN_SUPERCLASS,
+          "Class used as mixin must have Object as superclass."),
+
+      MessageKind.ILLEGAL_MIXIN_OBJECT:
+        const MessageTemplate(MessageKind.ILLEGAL_MIXIN_OBJECT,
+          "Cannot use Object as mixin."),
+
+      MessageKind.ILLEGAL_MIXIN_CONSTRUCTOR:
+        const MessageTemplate(MessageKind.ILLEGAL_MIXIN_CONSTRUCTOR,
+          "Class used as mixin cannot have non-factory constructor."),
+
+      MessageKind.ILLEGAL_MIXIN_CYCLE:
+        const MessageTemplate(MessageKind.ILLEGAL_MIXIN_CYCLE,
+          "Class used as mixin introduces mixin cycle: "
+          "'#{mixinName1}' <-> '#{mixinName2}'."),
+
+      MessageKind.ILLEGAL_MIXIN_WITH_SUPER:
+        const MessageTemplate(MessageKind.ILLEGAL_MIXIN_WITH_SUPER,
+          "Cannot use class '#{className}' as a mixin because it uses "
+          "'super'."),
+
+      MessageKind.ILLEGAL_MIXIN_SUPER_USE:
+        const MessageTemplate(MessageKind.ILLEGAL_MIXIN_SUPER_USE,
+          "Use of 'super' in class used as mixin."),
+
+      MessageKind.PARAMETER_NAME_EXPECTED:
+        const MessageTemplate(MessageKind.PARAMETER_NAME_EXPECTED,
+          "parameter name expected."),
+
+      MessageKind.CANNOT_RESOLVE_GETTER:
+        const MessageTemplate(MessageKind.CANNOT_RESOLVE_GETTER,
+          "Cannot resolve getter."),
+
+      MessageKind.CANNOT_RESOLVE_SETTER:
+        const MessageTemplate(MessageKind.CANNOT_RESOLVE_SETTER,
+          "Cannot resolve setter."),
+
+      MessageKind.ASSIGNING_FINAL_FIELD_IN_SUPER:
+        const MessageTemplate(MessageKind.ASSIGNING_FINAL_FIELD_IN_SUPER,
+          "Cannot assign a value to final field '#{name}' "
+          "in superclass '#{superclassName}'."),
+
+      MessageKind.ASSIGNING_METHOD:
+        const MessageTemplate(MessageKind.ASSIGNING_METHOD,
+          "Cannot assign a value to a method."),
+
+      MessageKind.ASSIGNING_METHOD_IN_SUPER:
+        const MessageTemplate(MessageKind.ASSIGNING_METHOD_IN_SUPER,
+          "Cannot assign a value to method '#{name}' "
+          "in superclass '#{superclassName}'."),
+
+      MessageKind.ASSIGNING_TYPE:
+        const MessageTemplate(MessageKind.ASSIGNING_TYPE,
+          "Cannot assign a value to a type."),
+
+      MessageKind.IF_NULL_ASSIGNING_TYPE:
+        const MessageTemplate(MessageKind.IF_NULL_ASSIGNING_TYPE,
+          "Cannot assign a value to a type. Note that types are never null, "
+          "so this ??= assignment has no effect.",
+          howToFix: "Try removing the '??=' assignment.",
+          examples: const [
+              "class A {} main() { print(A ??= 3);}",
+          ]),
+
+      MessageKind.VOID_NOT_ALLOWED:
+        const MessageTemplate(MessageKind.VOID_NOT_ALLOWED,
+          "Type 'void' can't be used here because it isn't a return type.",
+          howToFix:
+            "Try removing 'void' keyword or replace it with 'var', 'final', "
+            "or a type.",
+          examples: const [
+              "void x; main() {}",
+              "foo(void x) {} main() { foo(null); }",
+          ]),
+
+      MessageKind.NULL_NOT_ALLOWED:
+        const MessageTemplate(MessageKind.NULL_NOT_ALLOWED,
+          "`null` can't be used here."),
+
+      MessageKind.BEFORE_TOP_LEVEL:
+        const MessageTemplate(MessageKind.BEFORE_TOP_LEVEL,
+          "Part header must come before top-level definitions."),
+
+      MessageKind.IMPORT_PART_OF:
+        const MessageTemplate(MessageKind.IMPORT_PART_OF,
+          "The imported library must not have a 'part-of' directive.",
+          howToFix: "Try removing the 'part-of' directive or replacing the "
+                    "import of the library with a 'part' directive.",
+          examples: const [const {
+'main.dart': """
+library library;
+
+import 'part.dart';
+
+main() {}
+""",
+
+'part.dart': """
+part of library;
+"""}]),
+
+      MessageKind.IMPORT_PART_OF_HERE:
+        const MessageTemplate(MessageKind.IMPORT_PART_OF_HERE,
+          "The library is imported here."),
+
+      MessageKind.MAIN_HAS_PART_OF:
+        const MessageTemplate(MessageKind.MAIN_HAS_PART_OF,
+          "The main application file must not have a 'part-of' directive.",
+          howToFix:  "Try removing the 'part-of' directive or starting "
+              "compilation from another file.",
+          examples: const [const {
+'main.dart': """
+part of library;
+
+main() {}
+"""}]),
+
+      MessageKind.LIBRARY_NAME_MISMATCH:
+        const MessageTemplate(MessageKind.LIBRARY_NAME_MISMATCH,
+          "Expected part of library name '#{libraryName}'.",
+          howToFix: "Try changing the directive to 'part of #{libraryName};'.",
+          examples: const [const {
+'main.dart': """
+library lib.foo;
+
+part 'part.dart';
+
+main() {}
+""",
+
+'part.dart': """
+part of lib.bar;
+"""}]),
+
+      MessageKind.MISSING_LIBRARY_NAME:
+        const MessageTemplate(MessageKind.MISSING_LIBRARY_NAME,
+          "Library has no name. Part directive expected library name "
+          "to be '#{libraryName}'.",
+          howToFix: "Try adding 'library #{libraryName};' to the library.",
+          examples: const [const {
+'main.dart': """
+part 'part.dart';
+
+main() {}
+""",
+
+'part.dart': """
+part of lib.foo;
+"""}]),
+
+      MessageKind.THIS_IS_THE_PART_OF_TAG:
+        const MessageTemplate(MessageKind.THIS_IS_THE_PART_OF_TAG,
+          "This is the part of directive."),
+
+      MessageKind.MISSING_PART_OF_TAG:
+        const MessageTemplate(MessageKind.MISSING_PART_OF_TAG,
+          "This file has no part-of tag, but it is being used as a part."),
+
+      MessageKind.DUPLICATED_PART_OF:
+        const MessageTemplate(MessageKind.DUPLICATED_PART_OF,
+          "Duplicated part-of directive."),
+
+      MessageKind.DUPLICATED_LIBRARY_NAME:
+        const MessageTemplate(MessageKind.DUPLICATED_LIBRARY_NAME,
+          "Duplicated library name '#{libraryName}'."),
+
+      MessageKind.DUPLICATED_RESOURCE:
+        const MessageTemplate(MessageKind.DUPLICATED_RESOURCE,
+          "The resource '#{resourceUri}' is loaded through both "
+          "'#{canonicalUri1}' and '#{canonicalUri2}'."),
+
+      MessageKind.DUPLICATED_LIBRARY_RESOURCE:
+        const MessageTemplate(MessageKind.DUPLICATED_LIBRARY_RESOURCE,
+          "The library '#{libraryName}' in '#{resourceUri}' is loaded through "
+          "both '#{canonicalUri1}' and '#{canonicalUri2}'."),
+
+      // This is used as an exception.
+      MessageKind.INVALID_SOURCE_FILE_LOCATION:
+        const MessageTemplate(MessageKind.INVALID_SOURCE_FILE_LOCATION, '''
+Invalid offset (#{offset}) in source map.
+File: #{fileName}
+Length: #{length}'''),
+
+      MessageKind.TOP_LEVEL_VARIABLE_DECLARED_STATIC:
+        const MessageTemplate(MessageKind.TOP_LEVEL_VARIABLE_DECLARED_STATIC,
+              "Top-level variable cannot be declared static."),
+
+      MessageKind.REFERENCE_IN_INITIALIZATION:
+        const MessageTemplate(MessageKind.REFERENCE_IN_INITIALIZATION,
+           "Variable '#{variableName}' is referenced during its "
+           "initialization.",
+           howToFix:
+             "If you are trying to reference a shadowed variable, rename "
+             "one of the variables.",
+           examples: const ["""
+foo(t) {
+  var t = t;
+  return t;
+}
+
+main() => foo(1);
+"""]),
+
+      MessageKind.CONST_WITHOUT_INITIALIZER:
+        const MessageTemplate(MessageKind.CONST_WITHOUT_INITIALIZER,
+          "A constant variable must be initialized.",
+          howToFix: "Try adding an initializer or "
+                    "removing the 'const' modifier.",
+          examples: const ["""
+void main() {
+  const c; // This constant variable must be initialized.
+}"""]),
+
+      MessageKind.FINAL_WITHOUT_INITIALIZER:
+        const MessageTemplate(MessageKind.FINAL_WITHOUT_INITIALIZER,
+          "A final variable must be initialized.",
+          howToFix: "Try adding an initializer or "
+                    "removing the 'final' modifier.",
+          examples: const [
+              "class C { static final field; } main() => C.field;"]),
+
+      MessageKind.CONST_LOOP_VARIABLE:
+        const MessageTemplate(MessageKind.CONST_LOOP_VARIABLE,
+          "A loop variable cannot be constant.",
+          howToFix: "Try remove the 'const' modifier or "
+                    "replacing it with a 'final' modifier.",
+          examples: const ["""
+void main() {
+  for (const c in []) {}
+}"""]),
+
+      MessageKind.MEMBER_USES_CLASS_NAME:
+        const MessageTemplate(MessageKind.MEMBER_USES_CLASS_NAME,
+          "Member variable can't have the same name as the class it is "
+          "declared in.",
+          howToFix: "Try renaming the variable.",
+          examples: const ["""
+class A { var A; }
+main() {
+  var a = new A();
+  a.A = 1;
+}
+""", """
+class A { static var A; }
+main() => A.A = 1;
+"""]),
+
+      MessageKind.WRONG_NUMBER_OF_ARGUMENTS_FOR_ASSERT:
+        const MessageTemplate(
+          MessageKind.WRONG_NUMBER_OF_ARGUMENTS_FOR_ASSERT,
+          "Wrong number of arguments to assert. Should be 1, but given "
+          "#{argumentCount}."),
+
+      MessageKind.ASSERT_IS_GIVEN_NAMED_ARGUMENTS:
+        const MessageTemplate(MessageKind.ASSERT_IS_GIVEN_NAMED_ARGUMENTS,
+          "'assert' takes no named arguments, but given #{argumentCount}."),
+
+      MessageKind.FACTORY_REDIRECTION_IN_NON_FACTORY:
+        const MessageTemplate(MessageKind.FACTORY_REDIRECTION_IN_NON_FACTORY,
+          "Factory redirection only allowed in factories."),
+
+      MessageKind.MISSING_FACTORY_KEYWORD:
+        const MessageTemplate(MessageKind.MISSING_FACTORY_KEYWORD,
+          "Did you forget a factory keyword here?"),
+
+      MessageKind.NO_SUCH_METHOD_IN_NATIVE:
+        const MessageTemplate(MessageKind.NO_SUCH_METHOD_IN_NATIVE,
+          "'NoSuchMethod' is not supported for classes that extend native "
+          "classes."),
+
+      MessageKind.DEFERRED_LIBRARY_DART_2_DART:
+        const MessageTemplate(MessageKind.DEFERRED_LIBRARY_DART_2_DART,
+          "Deferred loading is not supported by the dart backend yet. "
+          "The output will not be split."),
+
+      MessageKind.DEFERRED_LIBRARY_WITHOUT_PREFIX:
+        const MessageTemplate(MessageKind.DEFERRED_LIBRARY_WITHOUT_PREFIX,
+          "This import is deferred but there is no prefix keyword.",
+          howToFix: "Try adding a prefix to the import."),
+
+      MessageKind.DEFERRED_OLD_SYNTAX:
+        const MessageTemplate(MessageKind.DEFERRED_OLD_SYNTAX,
+          "The DeferredLibrary annotation is obsolete.",
+          howToFix:
+            "Use the \"import 'lib.dart' deferred as prefix\" syntax instead."),
+
+      MessageKind.DEFERRED_LIBRARY_DUPLICATE_PREFIX:
+        const MessageTemplate(MessageKind.DEFERRED_LIBRARY_DUPLICATE_PREFIX,
+          "The prefix of this deferred import is not unique.",
+          howToFix: "Try changing the import prefix."),
+
+      MessageKind.DEFERRED_TYPE_ANNOTATION:
+        const MessageTemplate(MessageKind.DEFERRED_TYPE_ANNOTATION,
+          "The type #{node} is deferred. "
+          "Deferred types are not valid as type annotations.",
+          howToFix:
+            "Try using a non-deferred abstract class as an interface."),
+
+      MessageKind.ILLEGAL_STATIC:
+        const MessageTemplate(MessageKind.ILLEGAL_STATIC,
+          "Modifier static is only allowed on functions declared in "
+          "a class."),
+
+      MessageKind.STATIC_FUNCTION_BLOAT:
+        const MessageTemplate(MessageKind.STATIC_FUNCTION_BLOAT,
+          "Using '#{class}.#{name}' may lead to unnecessarily large "
+          "generated code.",
+          howToFix:
+              "Try adding '@MirrorsUsed(...)' as described at "
+              "https://goo.gl/Akrrog."),
+
+      MessageKind.NON_CONST_BLOAT:
+        const MessageTemplate(MessageKind.NON_CONST_BLOAT,
+          "Using 'new #{name}' may lead to unnecessarily large generated "
+          "code.",
+          howToFix:
+              "Try using 'const #{name}' or adding '@MirrorsUsed(...)' as "
+              "described at https://goo.gl/Akrrog."),
+
+      MessageKind.STRING_EXPECTED:
+        const MessageTemplate(MessageKind.STRING_EXPECTED,
+          "Expected a 'String', but got an instance of '#{type}'."),
+
+      MessageKind.PRIVATE_IDENTIFIER:
+        const MessageTemplate(MessageKind.PRIVATE_IDENTIFIER,
+          "'#{value}' is not a valid Symbol name because it starts with "
+          "'_'."),
+
+      MessageKind.PRIVATE_NAMED_PARAMETER:
+        const MessageTemplate(MessageKind.PRIVATE_NAMED_PARAMETER,
+          "Named optional parameter can't have a library private name.",
+          howToFix:
+            "Try removing the '_' or making the parameter positional or "
+            "required.",
+          examples: const ["""foo({int _p}) {} main() => foo();"""]),
+
+      MessageKind.UNSUPPORTED_LITERAL_SYMBOL:
+        const MessageTemplate(MessageKind.UNSUPPORTED_LITERAL_SYMBOL,
+          "Symbol literal '##{value}' is currently unsupported by dart2js."),
+
+      MessageKind.INVALID_SYMBOL:
+        const MessageTemplate(MessageKind.INVALID_SYMBOL, '''
+'#{value}' is not a valid Symbol name because is not:
+ * an empty String,
+ * a user defined operator,
+ * a qualified non-private identifier optionally followed by '=', or
+ * a qualified non-private identifier followed by '.' and a user-defined '''
+"operator."),
+
+      MessageKind.AMBIGUOUS_REEXPORT:
+        const MessageTemplate(MessageKind.AMBIGUOUS_REEXPORT,
+          "'#{name}' is (re)exported by multiple libraries."),
+
+      MessageKind.AMBIGUOUS_LOCATION:
+        const MessageTemplate(MessageKind.AMBIGUOUS_LOCATION,
+          "'#{name}' is defined here."),
+
+      MessageKind.IMPORTED_HERE:
+        const MessageTemplate(MessageKind.IMPORTED_HERE,
+          "'#{name}' is imported here."),
+
+      MessageKind.OVERRIDE_EQUALS_NOT_HASH_CODE:
+        const MessageTemplate(MessageKind.OVERRIDE_EQUALS_NOT_HASH_CODE,
+          "The class '#{class}' overrides 'operator==', "
+          "but not 'get hashCode'."),
+
+      MessageKind.INTERNAL_LIBRARY_FROM:
+        const MessageTemplate(MessageKind.INTERNAL_LIBRARY_FROM,
+          "Internal library '#{resolvedUri}' is not accessible from "
+          "'#{importingUri}'."),
+
+      MessageKind.INTERNAL_LIBRARY:
+        const MessageTemplate(MessageKind.INTERNAL_LIBRARY,
+          "Internal library '#{resolvedUri}' is not accessible."),
+
+      MessageKind.JS_INTEROP_CLASS_CANNOT_EXTEND_DART_CLASS:
+        const MessageTemplate(
+          MessageKind.JS_INTEROP_CLASS_CANNOT_EXTEND_DART_CLASS,
+          "Js-interop class '#{cls}' cannot extend from the non js-interop "
+          "class '#{superclass}'.",
+          howToFix: "Annotate the superclass with @JS.",
+          examples: const [
+              """
+              import 'package:js/js.dart';
+
+              class Foo { }
+
+              @JS()
+              class Bar extends Foo { }
+
+              main() {
+                new Bar();
+              }
+              """]),
+
+      MessageKind.JS_INTEROP_CLASS_NON_EXTERNAL_MEMBER:
+        const MessageTemplate(
+          MessageKind.JS_INTEROP_CLASS_NON_EXTERNAL_MEMBER,
+          "Member '#{member}' in js-interop class '#{cls}' is not external.",
+          howToFix: "Mark all interop methods external",
+          examples: const [
+              """
+              import 'package:js/js.dart';
+
+              @JS()
+              class Foo {
+                bar() {}
+              }
+
+              main() {
+                new Foo().bar();
+              }
+              """]),
+
+      MessageKind.JS_INTEROP_METHOD_WITH_NAMED_ARGUMENTS:
+        const MessageTemplate(
+          MessageKind.JS_INTEROP_METHOD_WITH_NAMED_ARGUMENTS,
+          "Js-interop method '#{method}' has named arguments but is not "
+          "a factory constructor of an @anonymous @JS class.",
+          howToFix: "Remove all named arguments from js-interop method or "
+                    "in the case of a factory constructor annotate the class "
+                    "as @anonymous.",
+          examples: const [
+              """
+              import 'package:js/js.dart';
+
+              @JS()
+              class Foo {
+                external bar(foo, {baz});
+              }
+
+              main() {
+                new Foo().bar(4, baz: 5);
+              }
+              """]),
+
+      MessageKind.JS_OBJECT_LITERAL_CONSTRUCTOR_WITH_POSITIONAL_ARGUMENTS:
+        const MessageTemplate(
+          MessageKind.JS_OBJECT_LITERAL_CONSTRUCTOR_WITH_POSITIONAL_ARGUMENTS,
+          "Parameter '#{parameter}' in anonymous js-interop class '#{cls}' "
+          "object literal constructor is positional instead of named."
+          ".",
+          howToFix: "Make all arguments in external factory object literal "
+                    "constructors named.",
+          examples: const [
+              """
+              import 'package:js/js.dart';
+
+              @anonymous
+              @JS()
+              class Foo {
+                external factory Foo(foo, {baz});
+              }
+
+              main() {
+                new Foo(5, baz: 5);
+              }
+              """]),
+
+      MessageKind.LIBRARY_NOT_FOUND:
+        const MessageTemplate(MessageKind.LIBRARY_NOT_FOUND,
+          "Library not found '#{resolvedUri}'."),
+
+      MessageKind.LIBRARY_NOT_SUPPORTED:
+        const MessageTemplate(MessageKind.LIBRARY_NOT_SUPPORTED,
+          "Library not supported '#{resolvedUri}'.",
+          howToFix: "Try removing the dependency or enabling support using "
+                    "the '--categories' option.",
+          examples: const [/*
+              """
+              import 'dart:io';
+              main() {}
+              """
+          */]),
+          // TODO(johnniwinther): Enable example when message_kind_test.dart
+          // supports library loader callbacks.
+
+      MessageKind.UNSUPPORTED_EQ_EQ_EQ:
+        const MessageTemplate(MessageKind.UNSUPPORTED_EQ_EQ_EQ,
+          "'===' is not an operator. "
+          "Did you mean '#{lhs} == #{rhs}' or 'identical(#{lhs}, #{rhs})'?"),
+
+      MessageKind.UNSUPPORTED_BANG_EQ_EQ:
+        const MessageTemplate(MessageKind.UNSUPPORTED_BANG_EQ_EQ,
+          "'!==' is not an operator. "
+          "Did you mean '#{lhs} != #{rhs}' or '!identical(#{lhs}, #{rhs})'?"),
+
+      MessageKind.UNSUPPORTED_PREFIX_PLUS:
+        const MessageTemplate(MessageKind.UNSUPPORTED_PREFIX_PLUS,
+          "'+' is not a prefix operator. ",
+          howToFix: "Try removing '+'.",
+          examples: const [
+              "main() => +2;  // No longer a valid way to write '2'"
+          ]),
+
+      MessageKind.UNSUPPORTED_THROW_WITHOUT_EXP:
+        const MessageTemplate(MessageKind.UNSUPPORTED_THROW_WITHOUT_EXP,
+          "No expression after 'throw'. "
+          "Did you mean 'rethrow'?"),
+
+      MessageKind.DEPRECATED_TYPEDEF_MIXIN_SYNTAX:
+        const MessageTemplate(MessageKind.DEPRECATED_TYPEDEF_MIXIN_SYNTAX,
+          "'typedef' not allowed here. ",
+          howToFix: "Try replacing 'typedef' with 'class'.",
+          examples: const [
+              """
+class B { }
+class M1 {  }
+typedef C = B with M1;  // Need to replace 'typedef' with 'class'.
+main() { new C(); }
+"""]),
+
+      MessageKind.MIRRORS_EXPECTED_STRING:
+        const MessageTemplate(MessageKind.MIRRORS_EXPECTED_STRING,
+          "Can't use '#{name}' here because it's an instance of '#{type}' "
+          "and a 'String' value is expected.",
+          howToFix: "Did you forget to add quotes?",
+          examples: const [
+              """
+// 'Foo' is a type literal, not a string.
+@MirrorsUsed(symbols: const [Foo])
+import 'dart:mirrors';
+
+class Foo {}
+
+main() {}
+"""]),
+
+      MessageKind.MIRRORS_EXPECTED_STRING_OR_TYPE:
+        const MessageTemplate(MessageKind.MIRRORS_EXPECTED_STRING_OR_TYPE,
+          "Can't use '#{name}' here because it's an instance of '#{type}' "
+          "and a 'String' or 'Type' value is expected.",
+          howToFix: "Did you forget to add quotes?",
+          examples: const [
+              """
+// 'main' is a method, not a class.
+@MirrorsUsed(targets: const [main])
+import 'dart:mirrors';
+
+main() {}
+"""]),
+
+      MessageKind.MIRRORS_EXPECTED_STRING_OR_LIST:
+        const MessageTemplate(MessageKind.MIRRORS_EXPECTED_STRING_OR_LIST,
+          "Can't use '#{name}' here because it's an instance of '#{type}' "
+          "and a 'String' or 'List' value is expected.",
+          howToFix: "Did you forget to add quotes?",
+          examples: const [
+              """
+// 'Foo' is not a string.
+@MirrorsUsed(symbols: Foo)
+import 'dart:mirrors';
+
+class Foo {}
+
+main() {}
+"""]),
+
+      MessageKind.MIRRORS_EXPECTED_STRING_TYPE_OR_LIST:
+        const MessageTemplate(MessageKind.MIRRORS_EXPECTED_STRING_TYPE_OR_LIST,
+          "Can't use '#{name}' here because it's an instance of '#{type}' "
+          "but a 'String', 'Type', or 'List' value is expected.",
+          howToFix: "Did you forget to add quotes?",
+          examples: const [
+              """
+// '1' is not a string.
+@MirrorsUsed(targets: 1)
+import 'dart:mirrors';
+
+main() {}
+"""]),
+
+      MessageKind.MIRRORS_CANNOT_RESOLVE_IN_CURRENT_LIBRARY:
+        const MessageTemplate(
+          MessageKind.MIRRORS_CANNOT_RESOLVE_IN_CURRENT_LIBRARY,
+          "Can't find '#{name}' in the current library.",
+          // TODO(ahe): The closest identifiers in edit distance would be nice.
+          howToFix: "Did you forget to add an import?",
+          examples: const [
+              """
+// 'window' is not in scope because dart:html isn't imported.
+@MirrorsUsed(targets: 'window')
+import 'dart:mirrors';
+
+main() {}
+"""]),
+
+      MessageKind.MIRRORS_CANNOT_RESOLVE_IN_LIBRARY:
+        const MessageTemplate(MessageKind.MIRRORS_CANNOT_RESOLVE_IN_LIBRARY,
+          "Can't find '#{name}' in the library '#{library}'.",
+          // TODO(ahe): The closest identifiers in edit distance would be nice.
+          howToFix: "Is '#{name}' spelled right?",
+          examples: const [
+              """
+// 'List' is misspelled.
+@MirrorsUsed(targets: 'dart.core.Lsit')
+import 'dart:mirrors';
+
+main() {}
+"""]),
+
+      MessageKind.MIRRORS_CANNOT_FIND_IN_ELEMENT:
+        const MessageTemplate(MessageKind.MIRRORS_CANNOT_FIND_IN_ELEMENT,
+          "Can't find '#{name}' in '#{element}'.",
+          // TODO(ahe): The closest identifiers in edit distance would be nice.
+          howToFix: "Is '#{name}' spelled right?",
+          examples: const [
+              """
+// 'addAll' is misspelled.
+@MirrorsUsed(targets: 'dart.core.List.addAl')
+import 'dart:mirrors';
+
+main() {}
+"""]),
+
+      MessageKind.INVALID_URI:
+        const MessageTemplate(MessageKind.INVALID_URI,
+          "'#{uri}' is not a valid URI.",
+          howToFix: DONT_KNOW_HOW_TO_FIX,
+          examples: const [
+            """
+// can't have a '[' in a URI
+import '../../Udyn[mic ils/expect.dart';
+
+main() {}
+"""]),
+
+      MessageKind.INVALID_PACKAGE_CONFIG:
+          const MessageTemplate(MessageKind.INVALID_PACKAGE_CONFIG,
+            """Package config file '#{uri}' is invalid.
+#{exception}""",
+            howToFix: DONT_KNOW_HOW_TO_FIX
+      ),
+
+      MessageKind.INVALID_PACKAGE_URI:
+        const MessageTemplate(MessageKind.INVALID_PACKAGE_URI,
+          "'#{uri}' is not a valid package URI (#{exception}).",
+          howToFix: DONT_KNOW_HOW_TO_FIX,
+          examples: const [
+            """
+// can't have a 'top level' package URI
+import 'package:foo.dart';
+
+main() {}
+""", """
+// can't have 2 slashes
+import 'package://foo/foo.dart';
+
+main() {}
+""", """
+// package name must be valid
+import 'package:not\valid/foo.dart';
+
+main() {}
+"""]),
+
+      MessageKind.READ_SCRIPT_ERROR:
+        const MessageTemplate(MessageKind.READ_SCRIPT_ERROR,
+          "Can't read '#{uri}' (#{exception}).",
+          // Don't know how to fix since the underlying error is unknown.
+          howToFix: DONT_KNOW_HOW_TO_FIX,
+          examples: const [
+              """
+// 'foo.dart' does not exist.
+import 'foo.dart';
+
+main() {}
+"""]),
+
+      MessageKind.READ_SELF_ERROR:
+        const MessageTemplate(MessageKind.READ_SELF_ERROR,
+          "#{exception}",
+          // Don't know how to fix since the underlying error is unknown.
+          howToFix: DONT_KNOW_HOW_TO_FIX),
+
+      MessageKind.EXTRANEOUS_MODIFIER:
+        const MessageTemplate(MessageKind.EXTRANEOUS_MODIFIER,
+          "Can't have modifier '#{modifier}' here.",
+          howToFix: "Try removing '#{modifier}'.",
+          examples: const [
+              "var String foo; main(){}",
+              // "var get foo; main(){}",
+              "var set foo; main(){}",
+              "var final foo; main(){}",
+              "var var foo; main(){}",
+              "var const foo; main(){}",
+              "var abstract foo; main(){}",
+              "var static foo; main(){}",
+              "var external foo; main(){}",
+              "get var foo; main(){}",
+              "set var foo; main(){}",
+              "final var foo; main(){}",
+              "var var foo; main(){}",
+              "const var foo; main(){}",
+              "abstract var foo; main(){}",
+              "static var foo; main(){}",
+              "external var foo; main(){}"]),
+
+      MessageKind.EXTRANEOUS_MODIFIER_REPLACE:
+        const MessageTemplate(MessageKind.EXTRANEOUS_MODIFIER_REPLACE,
+          "Can't have modifier '#{modifier}' here.",
+          howToFix:
+            "Try replacing modifier '#{modifier}' with 'var', 'final', "
+            "or a type.",
+          examples: const [
+              // "get foo; main(){}",
+              "set foo; main(){}",
+              "abstract foo; main(){}",
+              "static foo; main(){}",
+              "external foo; main(){}"]),
+
+      MessageKind.ABSTRACT_CLASS_INSTANTIATION:
+        const MessageTemplate(MessageKind.ABSTRACT_CLASS_INSTANTIATION,
+          "Can't instantiate abstract class.",
+          howToFix: DONT_KNOW_HOW_TO_FIX,
+          examples: const ["abstract class A {} main() { new A(); }"]),
+
+      MessageKind.BODY_EXPECTED:
+        const MessageTemplate(MessageKind.BODY_EXPECTED,
+          "Expected a function body or '=>'.",
+          // TODO(ahe): In some scenarios, we can suggest removing the 'static'
+          // keyword.
+          howToFix: "Try adding {}.",
+          examples: const [
+              "main();"]),
+
+      MessageKind.MIRROR_BLOAT:
+        const MessageTemplate(MessageKind.MIRROR_BLOAT,
+          "#{count} methods retained for use by dart:mirrors out of #{total}"
+          " total methods (#{percentage}%)."),
+
+      MessageKind.MIRROR_IMPORT:
+        const MessageTemplate(MessageKind.MIRROR_IMPORT,
+          "Import of 'dart:mirrors'."),
+
+      MessageKind.MIRROR_IMPORT_NO_USAGE:
+        const MessageTemplate(MessageKind.MIRROR_IMPORT_NO_USAGE,
+          "This import is not annotated with @MirrorsUsed, which may lead to "
+          "unnecessarily large generated code.",
+          howToFix:
+              "Try adding '@MirrorsUsed(...)' as described at "
+              "https://goo.gl/Akrrog."),
+
+      MessageKind.JS_PLACEHOLDER_CAPTURE:
+        const MessageTemplate(
+            MessageKind.JS_PLACEHOLDER_CAPTURE,
+            "JS code must not use '#' placeholders inside functions.",
+            howToFix:
+            "Use an immediately called JavaScript function to capture the"
+            " the placeholder values as JavaScript function parameters."),
+
+      MessageKind.WRONG_ARGUMENT_FOR_JS_INTERCEPTOR_CONSTANT:
+        const MessageTemplate(
+          MessageKind.WRONG_ARGUMENT_FOR_JS_INTERCEPTOR_CONSTANT,
+          "Argument for 'JS_INTERCEPTOR_CONSTANT' must be a type constant."),
+
+      MessageKind.EXPECTED_IDENTIFIER_NOT_RESERVED_WORD:
+        const MessageTemplate(MessageKind.EXPECTED_IDENTIFIER_NOT_RESERVED_WORD,
+              "'#{keyword}' is a reserved word and can't be used here.",
+              howToFix: "Try using a different name.",
+              examples: const ["do() {} main() {}"]),
+
+      MessageKind. NAMED_FUNCTION_EXPRESSION:
+        const MessageTemplate(MessageKind.NAMED_FUNCTION_EXPRESSION,
+          "Function expression '#{name}' cannot be named.",
+          howToFix: "Try removing the name.",
+          examples: const ["main() { var f = func() {}; }"]),
+
+      MessageKind.UNUSED_METHOD:
+        const MessageTemplate(MessageKind.UNUSED_METHOD,
+          "The method '#{name}' is never called.",
+          howToFix: "Consider deleting it.",
+          examples: const ["deadCode() {} main() {}"]),
+
+      MessageKind.UNUSED_CLASS:
+        const MessageTemplate(MessageKind.UNUSED_CLASS,
+          "The class '#{name}' is never used.",
+          howToFix: "Consider deleting it.",
+          examples: const ["class DeadCode {} main() {}"]),
+
+      MessageKind.UNUSED_TYPEDEF:
+        const MessageTemplate(MessageKind.UNUSED_TYPEDEF,
+          "The typedef '#{name}' is never used.",
+          howToFix: "Consider deleting it.",
+          examples: const ["typedef DeadCode(); main() {}"]),
+
+      MessageKind.ABSTRACT_METHOD:
+        const MessageTemplate(MessageKind.ABSTRACT_METHOD,
+          "The method '#{name}' has no implementation in "
+          "class '#{class}'.",
+          howToFix: "Try adding a body to '#{name}' or declaring "
+                    "'#{class}' to be 'abstract'.",
+          examples: const ["""
+class Class {
+  method();
+}
+main() => new Class().method();
+"""]),
+
+      MessageKind.ABSTRACT_GETTER:
+        const MessageTemplate(MessageKind.ABSTRACT_GETTER,
+          "The getter '#{name}' has no implementation in "
+          "class '#{class}'.",
+          howToFix: "Try adding a body to '#{name}' or declaring "
+                    "'#{class}' to be 'abstract'.",
+          examples: const ["""
+class Class {
+  get getter;
+}
+main() => new Class();
+"""]),
+
+      MessageKind.ABSTRACT_SETTER:
+        const MessageTemplate(MessageKind.ABSTRACT_SETTER,
+          "The setter '#{name}' has no implementation in "
+          "class '#{class}'.",
+          howToFix: "Try adding a body to '#{name}' or declaring "
+                    "'#{class}' to be 'abstract'.",
+          examples: const ["""
+class Class {
+  set setter(_);
+}
+main() => new Class();
+"""]),
+
+      MessageKind.INHERIT_GETTER_AND_METHOD:
+        const MessageTemplate(MessageKind.INHERIT_GETTER_AND_METHOD,
+          "The class '#{class}' can't inherit both getters and methods "
+          "by the named '#{name}'.",
+          howToFix: DONT_KNOW_HOW_TO_FIX,
+          examples: const ["""
+class A {
+  get member => null;
+}
+class B {
+  member() {}
+}
+class Class implements A, B {
+}
+main() => new Class();
+"""]),
+
+      MessageKind.INHERITED_METHOD:
+        const MessageTemplate(MessageKind.INHERITED_METHOD,
+          "The inherited method '#{name}' is declared here in class "
+          "'#{class}'."),
+
+      MessageKind.INHERITED_EXPLICIT_GETTER:
+        const MessageTemplate(MessageKind.INHERITED_EXPLICIT_GETTER,
+          "The inherited getter '#{name}' is declared here in class "
+          "'#{class}'."),
+
+      MessageKind.INHERITED_IMPLICIT_GETTER:
+        const MessageTemplate(MessageKind.INHERITED_IMPLICIT_GETTER,
+          "The inherited getter '#{name}' is implicitly declared by this "
+          "field in class '#{class}'."),
+
+      MessageKind.UNIMPLEMENTED_METHOD_ONE:
+        const MessageTemplate(MessageKind.UNIMPLEMENTED_METHOD_ONE,
+          "'#{class}' doesn't implement '#{method}' "
+          "declared in '#{declarer}'.",
+          howToFix: "Try adding an implementation of '#{name}' or declaring "
+                    "'#{class}' to be 'abstract'.",
+          examples: const ["""
+abstract class I {
+  m();
+}
+class C implements I {}
+main() => new C();
+""", """
+abstract class I {
+  m();
+}
+class C extends I {}
+main() => new C();
+"""]),
+
+      MessageKind.UNIMPLEMENTED_METHOD:
+        const MessageTemplate(MessageKind.UNIMPLEMENTED_METHOD,
+          "'#{class}' doesn't implement '#{method}'.",
+          howToFix: "Try adding an implementation of '#{name}' or declaring "
+                    "'#{class}' to be 'abstract'.",
+          examples: const ["""
+abstract class I {
+  m();
+}
+
+abstract class J {
+  m();
+}
+
+class C implements I, J {}
+
+main() {
+ new C();
+}
+""", """
+abstract class I {
+  m();
+}
+
+abstract class J {
+  m();
+}
+
+class C extends I implements J {}
+
+main() {
+ new C();
+}
+"""]),
+
+      MessageKind.UNIMPLEMENTED_METHOD_CONT:
+        const MessageTemplate(MessageKind.UNIMPLEMENTED_METHOD_CONT,
+          "The method '#{name}' is declared here in class '#{class}'."),
+
+      MessageKind.UNIMPLEMENTED_SETTER_ONE:
+        const MessageTemplate(MessageKind.UNIMPLEMENTED_SETTER_ONE,
+          "'#{class}' doesn't implement the setter '#{name}' "
+          "declared in '#{declarer}'.",
+          howToFix: "Try adding an implementation of '#{name}' or declaring "
+                    "'#{class}' to be 'abstract'.",
+          examples: const ["""
+abstract class I {
+  set m(_);
+}
+class C implements I {}
+class D implements I {
+  set m(_) {}
+}
+main() {
+ new D().m = 0;
+ new C();
+}
+"""]),
+
+      MessageKind.UNIMPLEMENTED_SETTER:
+        const MessageTemplate(MessageKind.UNIMPLEMENTED_SETTER,
+          "'#{class}' doesn't implement the setter '#{name}'.",
+          howToFix: "Try adding an implementation of '#{name}' or declaring "
+                    "'#{class}' to be 'abstract'.",
+          examples: const ["""
+abstract class I {
+  set m(_);
+}
+abstract class J {
+  set m(_);
+}
+class C implements I, J {}
+main() => new C();
+""", """
+abstract class I {
+  set m(_);
+}
+abstract class J {
+  set m(_);
+}
+class C extends I implements J {}
+main() => new C();
+"""]),
+
+      MessageKind.UNIMPLEMENTED_EXPLICIT_SETTER:
+        const MessageTemplate(MessageKind.UNIMPLEMENTED_EXPLICIT_SETTER,
+          "The setter '#{name}' is declared here in class '#{class}'."),
+
+      MessageKind.UNIMPLEMENTED_IMPLICIT_SETTER:
+        const MessageTemplate(MessageKind.UNIMPLEMENTED_IMPLICIT_SETTER,
+          "The setter '#{name}' is implicitly declared by this field "
+          "in class '#{class}'."),
+
+      MessageKind.UNIMPLEMENTED_GETTER_ONE:
+        const MessageTemplate(MessageKind.UNIMPLEMENTED_GETTER_ONE,
+          "'#{class}' doesn't implement the getter '#{name}' "
+          "declared in '#{declarer}'.",
+          howToFix: "Try adding an implementation of '#{name}' or declaring "
+                    "'#{class}' to be 'abstract'.",
+          examples: const ["""
+abstract class I {
+  get m;
+}
+class C implements I {}
+main() => new C();
+""", """
+abstract class I {
+  get m;
+}
+class C extends I {}
+main() => new C();
+"""]),
+
+      MessageKind.UNIMPLEMENTED_GETTER:
+        const MessageTemplate(MessageKind.UNIMPLEMENTED_GETTER,
+          "'#{class}' doesn't implement the getter '#{name}'.",
+          howToFix: "Try adding an implementation of '#{name}' or declaring "
+                    "'#{class}' to be 'abstract'.",
+          examples: const ["""
+abstract class I {
+  get m;
+}
+abstract class J {
+  get m;
+}
+class C implements I, J {}
+main() => new C();
+""", """
+abstract class I {
+  get m;
+}
+abstract class J {
+  get m;
+}
+class C extends I implements J {}
+main() => new C();
+"""]),
+
+      MessageKind.UNIMPLEMENTED_EXPLICIT_GETTER:
+        const MessageTemplate(MessageKind.UNIMPLEMENTED_EXPLICIT_GETTER,
+          "The getter '#{name}' is declared here in class '#{class}'."),
+
+      MessageKind.UNIMPLEMENTED_IMPLICIT_GETTER:
+        const MessageTemplate(MessageKind.UNIMPLEMENTED_IMPLICIT_GETTER,
+          "The getter '#{name}' is implicitly declared by this field "
+          "in class '#{class}'."),
+
+      MessageKind.INVALID_METADATA:
+        const MessageTemplate(MessageKind.INVALID_METADATA,
+          "A metadata annotation must be either a reference to a compile-time "
+          "constant variable or a call to a constant constructor.",
+          howToFix:
+            "Try using a different constant value or referencing it through a "
+            "constant variable.",
+          examples: const [
+'@Object main() {}',
+'@print main() {}']),
+
+      MessageKind.INVALID_METADATA_GENERIC:
+        const MessageTemplate(MessageKind.INVALID_METADATA_GENERIC,
+          "A metadata annotation using a constant constructor cannot use type "
+          "arguments.",
+          howToFix:
+            "Try removing the type arguments or referencing the constant "
+            "through a constant variable.",
+          examples: const ['''
+class C<T> {
+  const C();
+}
+@C<int>() main() {}
+''']),
+
+      MessageKind.EQUAL_MAP_ENTRY_KEY:
+        const MessageTemplate(MessageKind.EQUAL_MAP_ENTRY_KEY,
+          "An entry with the same key already exists in the map.",
+          howToFix:
+            "Try removing the previous entry or changing the key in one "
+            "of the entries.",
+          examples: const ["""
+main() {
+  var m = const {'foo': 1, 'foo': 2};
+}"""]),
+
+      MessageKind.BAD_INPUT_CHARACTER:
+        const MessageTemplate(MessageKind.BAD_INPUT_CHARACTER,
+          "Character U+#{characterHex} isn't allowed here.",
+          howToFix: DONT_KNOW_HOW_TO_FIX,
+          examples: const ["""
+main() {
+  String x = ç;
+}
+"""]),
+
+      MessageKind.UNTERMINATED_STRING:
+        const MessageTemplate(MessageKind.UNTERMINATED_STRING,
+          "String must end with #{quote}.",
+          howToFix: DONT_KNOW_HOW_TO_FIX,
+          examples: const ["""
+main() {
+  return '
+;
+}
+""",
+"""
+main() {
+  return \"
+;
+}
+""",
+"""
+main() {
+  return r'
+;
+}
+""",
+"""
+main() {
+  return r\"
+;
+}
+""",
+"""
+main() => '''
+""",
+"""
+main() => \"\"\"
+""",
+"""
+main() => r'''
+""",
+"""
+main() => r\"\"\"
+"""]),
+
+      MessageKind.UNMATCHED_TOKEN:
+        const MessageTemplate(MessageKind.UNMATCHED_TOKEN,
+          "Can't find '#{end}' to match '#{begin}'.",
+          howToFix: DONT_KNOW_HOW_TO_FIX,
+          examples: const[
+              "main(",
+              "main(){",
+              "main(){]}",
+            ]),
+
+      MessageKind.UNTERMINATED_TOKEN:
+        const MessageTemplate(MessageKind.UNTERMINATED_TOKEN,
+          // This is a fall-back message that shouldn't happen.
+          "Incomplete token."),
+
+      MessageKind.EXPONENT_MISSING:
+        const MessageTemplate(MessageKind.EXPONENT_MISSING,
+          "Numbers in exponential notation should always contain an exponent"
+          " (an integer number with an optional sign).",
+          howToFix:
+            "Make sure there is an exponent, and remove any whitespace "
+            "before it.",
+          examples: const ["""
+main() {
+  var i = 1e;
+}
+"""]),
+
+      MessageKind.HEX_DIGIT_EXPECTED:
+        const MessageTemplate(MessageKind.HEX_DIGIT_EXPECTED,
+          "A hex digit (0-9 or A-F) must follow '0x'.",
+          howToFix:
+            DONT_KNOW_HOW_TO_FIX, // Seems obvious from the error message.
+          examples: const ["""
+main() {
+  var i = 0x;
+}
+"""]),
+
+      MessageKind.MALFORMED_STRING_LITERAL:
+        const MessageTemplate(MessageKind.MALFORMED_STRING_LITERAL,
+          r"A '$' has special meaning inside a string, and must be followed by "
+          "an identifier or an expression in curly braces ({}).",
+          howToFix: r"Try adding a backslash (\) to escape the '$'.",
+          examples: const [r"""
+main() {
+  return '$';
+}
+""",
+r'''
+main() {
+  return "$";
+}
+''',
+r"""
+main() {
+  return '''$''';
+}
+""",
+r'''
+main() {
+  return """$""";
+}
+''']),
+
+      MessageKind.UNTERMINATED_COMMENT:
+        const MessageTemplate(MessageKind.UNTERMINATED_COMMENT,
+          "Comment starting with '/*' must end with '*/'.",
+          howToFix: DONT_KNOW_HOW_TO_FIX,
+          examples: const [r"""
+main() {
+}
+/*"""]),
+
+      MessageKind.MISSING_TOKEN_BEFORE_THIS:
+        const MessageTemplate(MessageKind.MISSING_TOKEN_BEFORE_THIS,
+          "Expected '#{token}' before this.",
+          // Consider the second example below: the parser expects a ')' before
+          // 'y', but a ',' would also have worked. We don't have enough
+          // information to give a good suggestion.
+          howToFix: DONT_KNOW_HOW_TO_FIX,
+          examples: const [
+              "main() => true ? 1;",
+              "main() => foo(x: 1 y: 2);",
+            ]),
+
+      MessageKind.MISSING_TOKEN_AFTER_THIS:
+        const MessageTemplate(MessageKind.MISSING_TOKEN_AFTER_THIS,
+          "Expected '#{token}' after this.",
+          // See [MISSING_TOKEN_BEFORE_THIS], we don't have enough information
+          // to give a good suggestion.
+          howToFix: DONT_KNOW_HOW_TO_FIX,
+          examples: const [
+              "main(x) {x}",
+"""
+class S1 {}
+class S2 {}
+class S3 {}
+class A = S1 with S2, S3
+main() => new A();
+"""
+]),
+
+      MessageKind.CONSIDER_ANALYZE_ALL:
+        const MessageTemplate(MessageKind.CONSIDER_ANALYZE_ALL,
+          "Could not find '#{main}'.  Nothing will be analyzed.",
+          howToFix: "Try using '--analyze-all' to analyze everything.",
+          examples: const ['']),
+
+      MessageKind.MISSING_MAIN:
+        const MessageTemplate(MessageKind.MISSING_MAIN,
+          "Could not find '#{main}'.",
+          howToFix: "Try adding a method named '#{main}' to your program."
+          /* No example, test uses '--analyze-only' which will produce the above
+           * message [CONSIDER_ANALYZE_ALL].  An example for a human operator
+           * would be an empty file.*/),
+
+      MessageKind.MAIN_NOT_A_FUNCTION:
+        const MessageTemplate(MessageKind.MAIN_NOT_A_FUNCTION,
+          "'#{main}' is not a function.",
+          howToFix: DONT_KNOW_HOW_TO_FIX, /* Don't state the obvious. */
+          examples: const ['var main;']),
+
+      MessageKind.MAIN_WITH_EXTRA_PARAMETER:
+        const MessageTemplate(MessageKind.MAIN_WITH_EXTRA_PARAMETER,
+          "'#{main}' cannot have more than two parameters.",
+          howToFix: DONT_KNOW_HOW_TO_FIX, /* Don't state the obvious. */
+          examples: const ['main(a, b, c) {}']),
+
+      MessageKind.COMPILER_CRASHED:
+        const MessageTemplate(MessageKind.COMPILER_CRASHED,
+          "The compiler crashed when compiling this element."),
+
+      MessageKind.PLEASE_REPORT_THE_CRASH:
+        const MessageTemplate(MessageKind.PLEASE_REPORT_THE_CRASH, '''
+The compiler is broken.
+
+When compiling the above element, the compiler crashed. It is not
+possible to tell if this is caused by a problem in your program or
+not. Regardless, the compiler should not crash.
+
+The Dart team would greatly appreciate if you would take a moment to
+report this problem at http://dartbug.com/new.
+
+Please include the following information:
+
+* the name and version of your operating system,
+
+* the Dart SDK build number (#{buildId}), and
+
+* the entire message you see here (including the full stack trace
+  below as well as the source location above).
+'''),
+
+      MessageKind.POTENTIAL_MUTATION:
+        const MessageTemplate(MessageKind.POTENTIAL_MUTATION,
+          "Variable '#{variableName}' is not known to be of type "
+          "'#{shownType}' because it is potentially mutated in the scope for "
+          "promotion."),
+
+      MessageKind.POTENTIAL_MUTATION_HERE:
+        const MessageTemplate(MessageKind.POTENTIAL_MUTATION_HERE,
+          "Variable '#{variableName}' is potentially mutated here."),
+
+      MessageKind.POTENTIAL_MUTATION_IN_CLOSURE:
+        const MessageTemplate(MessageKind.POTENTIAL_MUTATION_IN_CLOSURE,
+          "Variable '#{variableName}' is not known to be of type "
+          "'#{shownType}' because it is potentially mutated within a closure."),
+
+      MessageKind.POTENTIAL_MUTATION_IN_CLOSURE_HERE:
+        const MessageTemplate(MessageKind.POTENTIAL_MUTATION_IN_CLOSURE_HERE,
+              "Variable '#{variableName}' is potentially mutated in a "
+              "closure here."),
+
+      MessageKind.ACCESSED_IN_CLOSURE:
+        const MessageTemplate(MessageKind.ACCESSED_IN_CLOSURE,
+          "Variable '#{variableName}' is not known to be of type "
+          "'#{shownType}' because it is accessed by a closure in the scope for "
+          "promotion and potentially mutated in the scope of "
+          "'#{variableName}'."),
+
+      MessageKind.ACCESSED_IN_CLOSURE_HERE:
+        const MessageTemplate(MessageKind.ACCESSED_IN_CLOSURE_HERE,
+          "Variable '#{variableName}' is accessed in a closure here."),
+
+      MessageKind.NOT_MORE_SPECIFIC:
+        const MessageTemplate(MessageKind.NOT_MORE_SPECIFIC,
+          "Variable '#{variableName}' is not shown to have type "
+          "'#{shownType}' because '#{shownType}' is not more specific than the "
+          "known type '#{knownType}' of '#{variableName}'."),
+
+      MessageKind.NOT_MORE_SPECIFIC_SUBTYPE:
+        const MessageTemplate(MessageKind.NOT_MORE_SPECIFIC_SUBTYPE,
+          "Variable '#{variableName}' is not shown to have type "
+          "'#{shownType}' because '#{shownType}' is not a subtype of the "
+          "known type '#{knownType}' of '#{variableName}'."),
+
+      MessageKind.NOT_MORE_SPECIFIC_SUGGESTION:
+        const MessageTemplate(MessageKind.NOT_MORE_SPECIFIC_SUGGESTION,
+          "Variable '#{variableName}' is not shown to have type "
+          "'#{shownType}' because '#{shownType}' is not more specific than the "
+          "known type '#{knownType}' of '#{variableName}'.",
+          howToFix:
+            "Try replacing '#{shownType}' with '#{shownTypeSuggestion}'."),
+
+      MessageKind.NO_COMMON_SUBTYPES:
+        const MessageTemplate(MessageKind.NO_COMMON_SUBTYPES,
+           "Types '#{left}' and '#{right}' have no common subtypes."),
+
+      MessageKind.HIDDEN_WARNINGS_HINTS:
+        const MessageTemplate(MessageKind.HIDDEN_WARNINGS_HINTS,
+          "#{warnings} warning(s) and #{hints} hint(s) suppressed in #{uri}."),
+
+      MessageKind.HIDDEN_WARNINGS:
+        const MessageTemplate(MessageKind.HIDDEN_WARNINGS,
+          "#{warnings} warning(s) suppressed in #{uri}."),
+
+      MessageKind.HIDDEN_HINTS:
+        const MessageTemplate(MessageKind.HIDDEN_HINTS,
+          "#{hints} hint(s) suppressed in #{uri}."),
+
+      MessageKind.PREAMBLE:
+        const MessageTemplate(MessageKind.PREAMBLE,
+        "When run on the command-line, the compiled output might"
+        " require a preamble file located in:\n"
+        "  <sdk>/lib/_internal/js_runtime/lib/preambles."),
+
+      MessageKind.INVALID_SYNC_MODIFIER:
+        const MessageTemplate(MessageKind.INVALID_SYNC_MODIFIER,
+          "Invalid modifier 'sync'.",
+          howToFix: "Try replacing 'sync' with 'sync*'.",
+          examples: const [
+            "main() sync {}"
+          ]),
+
+      MessageKind.INVALID_AWAIT_FOR:
+        const MessageTemplate(MessageKind.INVALID_AWAIT_FOR,
+          "'await' is only supported on for-in loops.",
+          howToFix: "Try rewriting the loop as a for-in loop or removing the "
+                    "'await' keyword.",
+          examples: const ["""
+main() async* {
+  await for (int i = 0; i < 10; i++) {}
+}
+"""]),
+
+      MessageKind.ASYNC_MODIFIER_ON_ABSTRACT_METHOD:
+        const MessageTemplate(MessageKind.ASYNC_MODIFIER_ON_ABSTRACT_METHOD,
+          "The modifier '#{modifier}' is not allowed on an abstract method.",
+          options: const ['--enable-async'],
+          howToFix: "Try removing the '#{modifier}' modifier or adding a "
+                    "body to the method.",
+          examples: const ["""
+abstract class A {
+  method() async;
+}
+class B extends A {
+  method() {}
+}
+main() {
+  A a = new B();
+  a.method();
+}
+"""]),
+
+      MessageKind.ASYNC_MODIFIER_ON_CONSTRUCTOR:
+        const MessageTemplate(MessageKind.ASYNC_MODIFIER_ON_CONSTRUCTOR,
+              "The modifier '#{modifier}' is not allowed on constructors.",
+              options: const ['--enable-async'],
+              howToFix: "Try removing the '#{modifier}' modifier.",
+              examples: const ["""
+class A {
+  A() async;
+}
+main() => new A();""",
+
+"""
+class A {
+  A();
+  factory A.a() async* {}
+}
+main() => new A.a();"""]),
+
+      MessageKind.ASYNC_MODIFIER_ON_SETTER:
+        const MessageTemplate(MessageKind.ASYNC_MODIFIER_ON_SETTER,
+              "The modifier '#{modifier}' is not allowed on setters.",
+              options: const ['--enable-async'],
+              howToFix: "Try removing the '#{modifier}' modifier.",
+              examples: const ["""
+class A {
+  set foo(v) async {}
+}
+main() => new A().foo = 0;"""]),
+
+      MessageKind.YIELDING_MODIFIER_ON_ARROW_BODY:
+        const MessageTemplate(MessageKind.YIELDING_MODIFIER_ON_ARROW_BODY,
+          "The modifier '#{modifier}' is not allowed on methods implemented "
+          "using '=>'.",
+          options: const ['--enable-async'],
+          howToFix: "Try removing the '#{modifier}' modifier or implementing "
+                    "the method body using a block: '{ ... }'.",
+          examples: const ["main() sync* => null;", "main() async* => null;"]),
+
+      // TODO(johnniwinther): Check for 'async' as identifier.
+      MessageKind.ASYNC_KEYWORD_AS_IDENTIFIER:
+        const MessageTemplate(MessageKind.ASYNC_KEYWORD_AS_IDENTIFIER,
+          "'#{keyword}' cannot be used as an identifier in a function body "
+          "marked with '#{modifier}'.",
+          options: const ['--enable-async'],
+          howToFix: "Try removing the '#{modifier}' modifier or renaming the "
+                    "identifier.",
+          examples: const ["""
+main() async {
+ var await;
+}""",
+"""
+main() async* {
+ var yield;
+}""",
+"""
+main() sync* {
+ var yield;
+}"""]),
+
+      MessageKind.RETURN_IN_GENERATOR:
+        const MessageTemplate(MessageKind.RETURN_IN_GENERATOR,
+          "'return' with a value is not allowed in a method body using the "
+          "'#{modifier}' modifier.",
+          howToFix: "Try removing the value, replacing 'return' with 'yield' "
+                    "or changing the method body modifier.",
+          examples: const [
+"""
+foo() async* { return 0; }
+main() => foo();
+""",
+
+"""
+foo() sync* { return 0; }
+main() => foo();
+"""]),
+
+      MessageKind.NATIVE_NOT_SUPPORTED:
+        const MessageTemplate(MessageKind.NATIVE_NOT_SUPPORTED,
+          "'native' modifier is not supported.",
+          howToFix: "Try removing the 'native' implementation or analyzing the "
+                    "code with the --allow-native-extensions option.",
+          examples: const ["""
+main() native "Main";
+"""]),
+
+      MessageKind.DART_EXT_NOT_SUPPORTED:
+        const MessageTemplate(MessageKind.DART_EXT_NOT_SUPPORTED,
+          "The 'dart-ext' scheme is not supported.",
+          howToFix: "Try analyzing the code with the --allow-native-extensions "
+                    "option.",
+          examples: const ["""
+import 'dart-ext:main';
+
+main() {}
+"""]),
+
+      MessageKind.LIBRARY_TAG_MUST_BE_FIRST:
+        const MessageTemplate(MessageKind.LIBRARY_TAG_MUST_BE_FIRST,
+          "The library declaration should come before other declarations.",
+          howToFix: "Try moving the declaration to the top of the file.",
+          examples: const [
+"""
+import 'dart:core';
+library foo;
+main() {}
+""",
+      ]),
+
+      MessageKind.ONLY_ONE_LIBRARY_TAG:
+        const MessageTemplate(MessageKind.ONLY_ONE_LIBRARY_TAG,
+          "There can only be one library declaration.",
+          howToFix: "Try removing all other library declarations.",
+          examples: const [
+"""
+library foo;
+library bar;
+main() {}
+""",
+"""
+library foo;
+import 'dart:core';
+library bar;
+main() {}
+""",
+      ]),
+
+      MessageKind.IMPORT_BEFORE_PARTS:
+        const MessageTemplate(MessageKind.IMPORT_BEFORE_PARTS,
+          "Import declarations should come before parts.",
+          howToFix: "Try moving this import further up in the file.",
+          examples: const [
+              const <String, String>{
+                'main.dart': """
+library test.main;
+part 'part.dart';
+import 'dart:core';
+main() {}
+""",
+                'part.dart': """
+part of test.main;
+""",
+          }]),
+
+      MessageKind.EXPORT_BEFORE_PARTS:
+        const MessageTemplate(MessageKind.EXPORT_BEFORE_PARTS,
+          "Export declarations should come before parts.",
+          howToFix: "Try moving this export further up in the file.",
+          examples: const [
+              const <String, String>{
+                'main.dart': """
+library test.main;
+part 'part.dart';
+export 'dart:core';
+main() {}
+""",
+               'part.dart': """
+part of test.main;
+""",
+          }]),
+
+  //////////////////////////////////////////////////////////////////////////////
+  // Patch errors start.
+  //////////////////////////////////////////////////////////////////////////////
+
+      MessageKind.PATCH_RETURN_TYPE_MISMATCH:
+        const MessageTemplate(MessageKind.PATCH_RETURN_TYPE_MISMATCH,
+          "Patch return type '#{patchReturnType}' does not match "
+          "'#{originReturnType}' on origin method '#{methodName}'."),
+
+      MessageKind.PATCH_REQUIRED_PARAMETER_COUNT_MISMATCH:
+        const MessageTemplate(
+          MessageKind.PATCH_REQUIRED_PARAMETER_COUNT_MISMATCH,
+          "Required parameter count of patch method "
+          "(#{patchParameterCount}) does not match parameter count on origin "
+          "method '#{methodName}' (#{originParameterCount})."),
+
+      MessageKind.PATCH_OPTIONAL_PARAMETER_COUNT_MISMATCH:
+        const MessageTemplate(
+          MessageKind.PATCH_OPTIONAL_PARAMETER_COUNT_MISMATCH,
+          "Optional parameter count of patch method "
+          "(#{patchParameterCount}) does not match parameter count on origin "
+          "method '#{methodName}' (#{originParameterCount})."),
+
+      MessageKind.PATCH_OPTIONAL_PARAMETER_NAMED_MISMATCH:
+        const MessageTemplate(
+          MessageKind.PATCH_OPTIONAL_PARAMETER_NAMED_MISMATCH,
+          "Optional parameters of origin and patch method "
+          "'#{methodName}' must both be either named or positional."),
+
+      MessageKind.PATCH_PARAMETER_MISMATCH:
+        const MessageTemplate(MessageKind.PATCH_PARAMETER_MISMATCH,
+          "Patch method parameter '#{patchParameter}' does not match "
+          "'#{originParameter}' on origin method '#{methodName}'."),
+
+      MessageKind.PATCH_PARAMETER_TYPE_MISMATCH:
+        const MessageTemplate(MessageKind.PATCH_PARAMETER_TYPE_MISMATCH,
+          "Patch method parameter '#{parameterName}' type "
+          "'#{patchParameterType}' does not match '#{originParameterType}' on "
+          "origin method '#{methodName}'."),
+
+      MessageKind.PATCH_EXTERNAL_WITHOUT_IMPLEMENTATION:
+        const MessageTemplate(MessageKind.PATCH_EXTERNAL_WITHOUT_IMPLEMENTATION,
+          "External method without an implementation."),
+
+      MessageKind.PATCH_POINT_TO_FUNCTION:
+        const MessageTemplate(MessageKind.PATCH_POINT_TO_FUNCTION,
+          "This is the function patch '#{functionName}'."),
+
+      MessageKind.PATCH_POINT_TO_CLASS:
+        const MessageTemplate(MessageKind.PATCH_POINT_TO_CLASS,
+          "This is the class patch '#{className}'."),
+
+      MessageKind.PATCH_POINT_TO_GETTER:
+        const MessageTemplate(MessageKind.PATCH_POINT_TO_GETTER,
+          "This is the getter patch '#{getterName}'."),
+
+      MessageKind.PATCH_POINT_TO_SETTER:
+        const MessageTemplate(MessageKind.PATCH_POINT_TO_SETTER,
+          "This is the setter patch '#{setterName}'."),
+
+      MessageKind.PATCH_POINT_TO_CONSTRUCTOR:
+        const MessageTemplate(MessageKind.PATCH_POINT_TO_CONSTRUCTOR,
+          "This is the constructor patch '#{constructorName}'."),
+
+      MessageKind.PATCH_POINT_TO_PARAMETER:
+        const MessageTemplate(MessageKind.PATCH_POINT_TO_PARAMETER,
+          "This is the patch parameter '#{parameterName}'."),
+
+      MessageKind.PATCH_NON_EXISTING:
+        const MessageTemplate(MessageKind.PATCH_NON_EXISTING,
+          "Origin does not exist for patch '#{name}'."),
+
+      // TODO(ahe): Eventually, this error should be removed as it will be
+      // handled by the regular parser.
+      MessageKind.PATCH_NONPATCHABLE:
+        const MessageTemplate(MessageKind.PATCH_NONPATCHABLE,
+          "Only classes and functions can be patched."),
+
+      MessageKind.PATCH_NON_EXTERNAL:
+        const MessageTemplate(MessageKind.PATCH_NON_EXTERNAL,
+          "Only external functions can be patched."),
+
+      MessageKind.PATCH_NON_CLASS:
+        const MessageTemplate(MessageKind.PATCH_NON_CLASS,
+          "Patching non-class with class patch '#{className}'."),
+
+      MessageKind.PATCH_NON_GETTER:
+        const MessageTemplate(MessageKind.PATCH_NON_GETTER,
+          "Cannot patch non-getter '#{name}' with getter patch."),
+
+      MessageKind.PATCH_NO_GETTER:
+        const MessageTemplate(MessageKind.PATCH_NO_GETTER,
+          "No getter found for getter patch '#{getterName}'."),
+
+      MessageKind.PATCH_NON_SETTER:
+        const MessageTemplate(MessageKind.PATCH_NON_SETTER,
+          "Cannot patch non-setter '#{name}' with setter patch."),
+
+      MessageKind.PATCH_NO_SETTER:
+        const MessageTemplate(MessageKind.PATCH_NO_SETTER,
+          "No setter found for setter patch '#{setterName}'."),
+
+      MessageKind.PATCH_NON_CONSTRUCTOR:
+        const MessageTemplate(MessageKind.PATCH_NON_CONSTRUCTOR,
+          "Cannot patch non-constructor with constructor patch "
+          "'#{constructorName}'."),
+
+      MessageKind.PATCH_NON_FUNCTION:
+        const MessageTemplate(MessageKind.PATCH_NON_FUNCTION,
+          "Cannot patch non-function with function patch "
+          "'#{functionName}'."),
+
+      MessageKind.INJECTED_PUBLIC_MEMBER:
+        const MessageTemplate(MessageKind.INJECTED_PUBLIC_MEMBER,
+            "Non-patch members in patch libraries must be private."),
+
+      MessageKind.EXTERNAL_WITH_BODY:
+        const MessageTemplate(MessageKind.EXTERNAL_WITH_BODY,
+          "External function '#{functionName}' cannot have a function body.",
+          options: const ["--output-type=dart"],
+          howToFix:
+            "Try removing the 'external' modifier or the function body.",
+          examples: const ["""
+external foo() => 0;
+main() => foo();
+""", """
+external foo() {}
+main() => foo();
+"""]),
+
+  //////////////////////////////////////////////////////////////////////////////
+  // Patch errors end.
+  //////////////////////////////////////////////////////////////////////////////
+
+      MessageKind.EXPERIMENTAL_ASSERT_MESSAGE:
+        const MessageTemplate(MessageKind.EXPERIMENTAL_ASSERT_MESSAGE,
+          "Experimental language feature 'assertion with message'"
+          " is not supported.",
+          howToFix:
+            "Use option '--assert-message' to use assertions with messages.",
+          examples: const [r'''
+main() {
+  int n = -7;
+  assert(n > 0, 'must be positive: $n');
+}
+''']),
+
+      MessageKind.IMPORT_EXPERIMENTAL_MIRRORS:
+        const MessageTemplate(MessageKind.IMPORT_EXPERIMENTAL_MIRRORS, r'''
+
+****************************************************************
+* WARNING: dart:mirrors support in dart2js is experimental,
+*          and not recommended.
+*          This implementation of mirrors is incomplete,
+*          and often greatly increases the size of the generated
+*          JavaScript code.
+*
+* Your app imports dart:mirrors via:''''''
+$IMPORT_EXPERIMENTAL_MIRRORS_PADDING#{importChain}
+*
+* You can disable this message by using the --enable-experimental-mirrors
+* command-line flag.
+*
+* To learn what to do next, please visit:
+*    http://dartlang.org/dart2js-reflection
+****************************************************************
+'''),
+
+      MessageKind.DISALLOWED_LIBRARY_IMPORT:
+        const MessageTemplate(MessageKind.DISALLOWED_LIBRARY_IMPORT, '''
+Your app imports the unsupported library '#{uri}' via:
+''''''
+$DISALLOWED_LIBRARY_IMPORT_PADDING#{importChain}
+
+Use the --categories option to support import of '#{uri}'.
+'''),
+
+      MessageKind.MIRRORS_LIBRARY_NOT_SUPPORT_BY_BACKEND:
+        const MessageTemplate(
+          MessageKind.MIRRORS_LIBRARY_NOT_SUPPORT_BY_BACKEND,
+          """
+dart:mirrors library is not supported when using this backend.
+
+Your app imports dart:mirrors via:""""""
+$MIRRORS_NOT_SUPPORTED_BY_BACKEND_PADDING#{importChain}"""),
+
+      MessageKind.CALL_NOT_SUPPORTED_ON_NATIVE_CLASS:
+        const MessageTemplate(MessageKind.CALL_NOT_SUPPORTED_ON_NATIVE_CLASS,
+          "Non-supported 'call' member on a native class, or a "
+          "subclass of a native class."),
+
+      MessageKind.DIRECTLY_THROWING_NSM:
+        const MessageTemplate(MessageKind.DIRECTLY_THROWING_NSM,
+          "This 'noSuchMethod' implementation is guaranteed to throw an "
+          "exception. The generated code will be smaller if it is "
+          "rewritten.",
+          howToFix: "Rewrite to "
+                    "'noSuchMethod(Invocation i) => super.noSuchMethod(i);'."),
+
+      MessageKind.COMPLEX_THROWING_NSM:
+        const MessageTemplate(MessageKind.COMPLEX_THROWING_NSM,
+          "This 'noSuchMethod' implementation is guaranteed to throw an "
+          "exception. The generated code will be smaller and the compiler "
+          "will be able to perform more optimizations if it is rewritten.",
+          howToFix: "Rewrite to "
+                    "'noSuchMethod(Invocation i) => super.noSuchMethod(i);'."),
+
+      MessageKind.COMPLEX_RETURNING_NSM:
+        const MessageTemplate(MessageKind.COMPLEX_RETURNING_NSM,
+          "Overriding 'noSuchMethod' causes the compiler to generate "
+          "more code and prevents the compiler from doing some optimizations.",
+          howToFix: "Consider removing this 'noSuchMethod' implementation."),
+
+      MessageKind.UNRECOGNIZED_VERSION_OF_LOOKUP_MAP:
+        const MessageTemplate(MessageKind.UNRECOGNIZED_VERSION_OF_LOOKUP_MAP,
+          "Unsupported version of package:lookup_map.",
+          howToFix: DONT_KNOW_HOW_TO_FIX),
+
+  }; // End of TEMPLATES.
+
+  /// Padding used before and between import chains in the message for
+  /// [MessageKind.IMPORT_EXPERIMENTAL_MIRRORS].
+  static const String IMPORT_EXPERIMENTAL_MIRRORS_PADDING = '\n*   ';
+
+  /// Padding used before and between import chains in the message for
+  /// [MessageKind.MIRRORS_LIBRARY_NOT_SUPPORT_BY_BACKEND].
+  static const String MIRRORS_NOT_SUPPORTED_BY_BACKEND_PADDING = '\n   ';
+
+  /// Padding used before and between import chains in the message for
+  /// [MessageKind.DISALLOWED_LIBRARY_IMPORT].
+  static const String DISALLOWED_LIBRARY_IMPORT_PADDING = '\n  ';
 
   toString() => template;
 
   Message message([Map arguments = const {}, bool terse = false]) {
     return new Message(this, arguments, terse);
   }
 
-  bool get hasHowToFix =>
-      howToFix != null && howToFix != dart2js_messages.DONT_KNOW_HOW_TO_FIX;
-
-  static final Map<MessageKind, MessageTemplate> TEMPLATES =
-      _constructMessageTemplates();
-
-  static String get IMPORT_EXPERIMENTAL_MIRRORS_PADDING =>
-      dart2js_messages.IMPORT_EXPERIMENTAL_MIRRORS_PADDING;
-
-  static String get MIRRORS_NOT_SUPPORTED_BY_BACKEND_PADDING =>
-      dart2js_messages.MIRRORS_NOT_SUPPORTED_BY_BACKEND_PADDING;
-
-  static String get DISALLOWED_LIBRARY_IMPORT_PADDING =>
-      dart2js_messages.DISALLOWED_LIBRARY_IMPORT_PADDING;
-
-  static Map<MessageKind, MessageTemplate> _constructMessageTemplates() {
-    Map<MessageKind, MessageTemplate> result = <MessageKind, MessageTemplate>{};
-    for (MessageKind kind in MessageKind.values) {
-      String name = _KIND_TO_STRING_MAP[kind];
-      if (name == null) {
-        throw new ArgumentError("No mapping for $kind in _KIND_TO_STRING_MAP");
-      }
-      Map data =
-          shared_messages.MESSAGES[name] ?? dart2js_messages.MESSAGES[name];
-      if (data == null) throw new ArgumentError.value(name);
-
-      String id = data['id'];
-      String template = data['template'];
-      String howToFix = data['howToFix'];
-      List examples = data['examples'];
-      List<String> options = data['options'] ?? const <String>[];
-      result[kind] =
-          new MessageTemplate(kind, id, template, howToFix, examples, options);
-    }
-    return result;
-  }
+  bool get hasHowToFix => howToFix != null && howToFix != DONT_KNOW_HOW_TO_FIX;
 }
 
 class Message {
   final MessageTemplate template;
   final Map arguments;
   final bool terse;
   String message;
 
   Message(this.template, this.arguments, this.terse) {
-    assert(() {
-      computeMessage();
-      return true;
-    });
+    assert(() { computeMessage(); return true; });
   }
 
   MessageKind get kind => template.kind;
 
   String computeMessage() {
     if (message == null) {
       message = template.template;
       arguments.forEach((key, value) {
         message = message.replaceAll('#{${key}}', convertToString(value));
       });
       assert(invariant(
           CURRENT_ELEMENT_SPANNABLE,
           kind == MessageKind.GENERIC ||
-              !message.contains(new RegExp(r'#\{.+\}')),
+            !message.contains(new RegExp(r'#\{.+\}')),
           message: 'Missing arguments in error message: "$message"'));
       if (!terse && template.hasHowToFix) {
         String howToFix = template.howToFix;
         arguments.forEach((key, value) {
           howToFix = howToFix.replaceAll('#{${key}}', convertToString(value));
         });
         message = '$message\n$howToFix';
       }
     }
     return message;
   }
 
   String toString() {
     return computeMessage();
   }
 
-  bool operator ==(other) {
-    if (other is! Message) return false;
+  bool operator==(other) {
+    if (other is !Message) return false;
     return (template == other.template) && (toString() == other.toString());
   }
 
   int get hashCode => throw new UnsupportedError('Message.hashCode');
 
   static String convertToString(value) {
     if (value is ErrorToken) {
       // Shouldn't happen.
       return value.assertionMessage;
     } else if (value is Token) {
       value = value.value;
     }
     return '$value';
   }
 }